diff --git a/saas/cart.py b/saas/cart.py
index 088ca48d..64c15f7a 100644
--- a/saas/cart.py
+++ b/saas/cart.py
@@ -68,9 +68,9 @@ def cart_insert_item(request, **kwargs):
             filter_args = None
             if sync_on:
                 if filter_args:
-                    filter_args |= Q(sync_on=sync_on)
+                    filter_args |= Q(sync_on__iexact=sync_on)
                 else:
-                    filter_args = Q(sync_on=sync_on)
+                    filter_args = Q(sync_on__iexact=sync_on)
             if option:
                 if filter_args:
                     filter_args |= Q(option=option)
@@ -95,7 +95,8 @@ def cart_insert_item(request, **kwargs):
                 use = template_item.use
             # Can we use that template?
             if sync_on:
-                if template_item.sync_on and template_item.sync_on != sync_on:
+                if (template_item.sync_on and
+                    template_item.sync_on.lower() != sync_on.lower()):
                     # conflicting sync_on. we cannot use the template.
                     template_item = None
             if template_item and option:
@@ -147,11 +148,14 @@ def cart_insert_item(request, **kwargs):
                     continue
                 if sync_on:
                     item_sync_on = item.get('sync_on')
-                    if item_sync_on and item_sync_on == sync_on:
+                    if (item_sync_on and
+                        item_sync_on.lower() == sync_on.lower()):
                         if not template_item:
                             template_item = item
                             continue
-                        if template_item.get('sync_on') != sync_on:
+                        template_sync_on = template_item.get('sync_on')
+                        if (template_sync_on and
+                            template_sync_on.lower() != sync_on.lower()):
                             # The item matches on sync_on but the template
                             # does not.
                             template_item = item
@@ -176,10 +180,12 @@ def cart_insert_item(request, **kwargs):
                                         if template_item.get('use') != use:
                                             template_item = item
                                             continue
-                    if (template_item and
-                        template_item.get('sync_on') == sync_on):
-                        # We already have a template matching on `sync_on`.
-                        continue
+                    if template_item:
+                        template_sync_on = template_item.get('sync_on')
+                        if (template_sync_on and
+                            template_sync_on.lower() == sync_on.lower()):
+                            # We already have a template matching on `sync_on`.
+                            continue
                 # Couldn't match on `sync_on`. next is `option`.
                 if option:
                     item_option = item.get('option')
@@ -227,7 +233,8 @@ def cart_insert_item(request, **kwargs):
             # Can we use that template?
             if sync_on:
                 template_sync_on = template_item.get('sync_on')
-                if template_sync_on and template_sync_on != sync_on:
+                if (template_sync_on and
+                    template_sync_on.lower() != sync_on.lower()):
                     # conflicting sync_on. we cannot use the template.
                     template_item = None
             if template_item and option:
@@ -311,7 +318,7 @@ def session_cart_to_database(request):
                         email != cart_item.email)):
                         continue
                     if (sync_on and (not cart_item.sync_on or
-                        sync_on != cart_item.sync_on)):
+                        sync_on.lower() != cart_item.sync_on.lower())):
                         continue
                     # We found a `CartItem` in the database that was can be
                     # further constrained by the cookie session item.
diff --git a/saas/humanize.py b/saas/humanize.py
index 4e8347ef..990f3bc1 100644
--- a/saas/humanize.py
+++ b/saas/humanize.py
@@ -263,9 +263,9 @@ def translate_descr_suffix(descr):
     pat = r"(a %(percent)s discount)?( and )?"\
         r"(%(nb_periods)s %(period_name)s free)?( and )?"\
         r"(a %(amount)s off)?"\
+        r"( \(code: %(code)s\))?"\
         r"(, complimentary of %(payer)s)?"\
-        r"(\s*for %(subscriber_full_name)s \(%(sync_on)s\))?"\
-        r"( \(code: %(code)s\))?" % REGEXES
+        r"(\s*for %(subscriber_full_name)s \(%(sync_on)s\))?" % REGEXES
     look = re.match(pat, descr_suffix)
     if look:
         descr_suffix = ""
@@ -291,6 +291,9 @@ def translate_descr_suffix(descr):
             descr_suffix += sep + _(DESCRIBE_SUFFIX_DISCOUNT_CURRENCY) % {
                 'amount': amount}
             sep = _(" and ")
+        code = look.group('code')
+        if code:
+            descr_suffix += _(DESCRIBE_SUFFIX_COUPON_APPLIED) % {'code': code}
         payer = look.group('payer')
         if payer:
             descr_suffix += _(", complimentary of %(payer)s") % {'payer': payer}
@@ -301,9 +304,6 @@ def translate_descr_suffix(descr):
                 'subscriber_full_name': subscriber_full_name,
                 'sync_on': sync_on
             }
-        code = look.group('code')
-        if code:
-            descr_suffix += _(DESCRIBE_SUFFIX_COUPON_APPLIED) % {'code': code}
 
     if descr_suffix:
         descr += " - %s" % descr_suffix
diff --git a/saas/models.py b/saas/models.py
index 4ee0ee2a..b53e276d 100644
--- a/saas/models.py
+++ b/saas/models.py
@@ -777,7 +777,7 @@ def execute_order(self, invoicables, user):
             if cart_items.exists():
                 # We are doing a groupBuy for a specified email.
                 bulk_items = cart_items.filter(
-                    sync_on=subscription.organization.email)
+                    sync_on__iexact=subscription.organization.email)
                 if bulk_items.exists():
                     cart_item = bulk_items.get()
                 else:
@@ -2357,9 +2357,13 @@ def to_sync(self, user):
         Returns charges which have been paid and a 3rd party asked
         to be notified about.
         """
-        results = self.filter(Q(sync_on=user.username) | Q(sync_on=user.email)
-            | Q(sync_on__in=get_organization_model().objects.accessible_by(user).values(
-                'slug').distinct()),
+        results = self.filter(Q(sync_on__iexact=user.email) |
+            # We don't do case-insensitive search here (i.e. `sync_on__in`)
+            # because we assume the case for sync_on field and username/slug
+            # are in sync here.
+            Q(sync_on=user.username) |
+            Q(sync_on__in=get_organization_model().objects.accessible_by(
+                user).values('slug').distinct()),
             charge__state=Charge.DONE, invoice_key__isnull=False)
         return results