diff --git a/registrasion/controllers/batch.py b/registrasion/controllers/batch.py
index 3cf95c8a..defd741e 100644
--- a/registrasion/controllers/batch.py
+++ b/registrasion/controllers/batch.py
@@ -107,16 +107,3 @@ class BatchController(object):
         cache = {}
         cache[cls._NESTING_KEY] = 0
         return cache
-
-'''
-TODO: memoise CartController.for_user
-TODO: memoise user_remainders (Product, Category)
-TODO: memoise _filtered_flags
-TODO: memoise FlagCounter.count() (doesn't take user, but it'll do for now)
-TODO: memoise _filtered_discounts
-
-Tests:
-- ``end_batch`` behaviour for CartController (use for_user *A LOT*)
-  - discounts not calculated until outermost batch point exits.
-  - Revision number shouldn't change until outermost batch point exits.
-'''
diff --git a/registrasion/controllers/category.py b/registrasion/controllers/category.py
index 4681f48b..4adf09b6 100644
--- a/registrasion/controllers/category.py
+++ b/registrasion/controllers/category.py
@@ -7,6 +7,7 @@ from django.db.models import Sum
 from django.db.models import When
 from django.db.models import Value
 
+from .batch import BatchController
 
 class AllProducts(object):
     pass
@@ -39,6 +40,7 @@ class CategoryController(object):
         return set(i.category for i in available)
 
     @classmethod
+    @BatchController.memoise
     def user_remainders(cls, user):
         '''
 
diff --git a/registrasion/controllers/discount.py b/registrasion/controllers/discount.py
index 29bc1ec6..108ed29b 100644
--- a/registrasion/controllers/discount.py
+++ b/registrasion/controllers/discount.py
@@ -1,6 +1,8 @@
 import itertools
 
-from conditions import ConditionController
+from .batch import BatchController
+from .conditions import ConditionController
+
 from registrasion.models import commerce
 from registrasion.models import conditions
 
@@ -10,7 +12,6 @@ from django.db.models import Sum
 from django.db.models import Value
 from django.db.models import When
 
-
 class DiscountAndQuantity(object):
     ''' Represents a discount that can be applied to a product or category
     for a given user.
@@ -99,6 +100,7 @@ class DiscountController(object):
         return discounts
 
     @classmethod
+    @BatchController.memoise
     def _filtered_clauses(cls, user):
         '''
 
diff --git a/registrasion/controllers/flag.py b/registrasion/controllers/flag.py
index 97456478..879d85f0 100644
--- a/registrasion/controllers/flag.py
+++ b/registrasion/controllers/flag.py
@@ -6,6 +6,7 @@ from collections import namedtuple
 from django.db.models import Count
 from django.db.models import Q
 
+from .batch import BatchController
 from .conditions import ConditionController
 
 from registrasion.models import conditions
@@ -115,7 +116,7 @@ class FlagController(object):
                 if not met and product not in messages:
                     messages[product] = message
 
-        total_flags = FlagCounter.count()
+        total_flags = FlagCounter.count(user)
 
         valid = {}
 
@@ -158,6 +159,7 @@ class FlagController(object):
         return error_fields
 
     @classmethod
+    @BatchController.memoise
     def _filtered_flags(cls, user):
         '''
 
@@ -209,11 +211,11 @@ _ConditionsCount = namedtuple(
 )
 
 
-# TODO: this should be cacheable.
 class FlagCounter(_FlagCounter):
 
     @classmethod
-    def count(cls):
+    @BatchController.memoise
+    def count(cls, user):
         # Get the count of how many conditions should exist per product
         flagbases = conditions.FlagBase.objects
 
diff --git a/registrasion/controllers/product.py b/registrasion/controllers/product.py
index 0810902b..4210bd7c 100644
--- a/registrasion/controllers/product.py
+++ b/registrasion/controllers/product.py
@@ -9,6 +9,7 @@ from django.db.models import Value
 from registrasion.models import commerce
 from registrasion.models import inventory
 
+from .batch import BatchController
 from .category import CategoryController
 from .flag import FlagController
 
@@ -55,6 +56,7 @@ class ProductController(object):
         return out
 
     @classmethod
+    @BatchController.memoise
     def user_remainders(cls, user):
         '''