Cheapest Maxtra cartridge water filter jug I could find. Normal Argos price £11.99 but currently on offer with £4 off (it says "Current selling price valid until 22/01/2010").
* Total capacity is 2.4 litres.
* Capacity of filtered water - up to 1.4 litres.
* Cartridge replacement indicator.
* Includes 1 MAXTRA cartridge.
* Designed to fit in fridge door.
* Dishwasher safe (excluding lid).
* Easy to use lid.
* MAXTRA cartridge:
* 1 cartridge - 1 month supply.
* Ring pull handles for easy removal.
* No pre-soaking required.
* Suitable for all water types.
* MAXTRA cartridges are 100% recyclable.
You can reserve for in store pick up.
Note : there are a couple of places online where you can buy a Brita filter jug cheaper (Robert Dyas £7.49 and Gordons Chemist £4.88 and £7.49) but they both have delivery charges.