7dayshop "GOOD TO GO" Rechargeable AA Batteries (2150 mAh) - Pack of 4 in FREE Case - LIMITED SPECIAL !! £3.99 @ Amazon/7dayshop
These are £4.49 on 7dayshop website and Ebay.
Before voting cold, please compare prices to other 'good to go' batteries with low self discharge. They are not standard NiMH.
They don't have the highest capacity, but are meant to hold their charge longer. Tend to get good reviews.