I saw this yesterday and thought it must be a miss-price but took one to the till at the Milton Keynes branch and sure enough, it rang up as £5.97+VAT!
That would be an amazing price for just the jug but it comes with 3 filters inside the box too. The cheapest place I have found a 6 pack of cartridges for is £19.99 + delivery, for this deal you can get 6 for £14.02 and have 2 brand new jugs for free!!!!
The cheapest jug I have found online is £7.90 but had no mention of filters and may well need delivery adding.
I don't know if it is the same at all Costco branches, you may want to check. first. Phone numbers for the branches can be found here: http://www.costco.co.uk/
Just to note: Costco also had the Cool Graphite colour available however this was priced around the £24 mark. This deal is only available on the White one. At 4pm yesterday in Milton Keynes they had plenty availble.
2.4 litre total capacity
1.4 litre filtered capacity
Suitable for fridge door
New contemporary design
Flip-top lid for one-handed filling
Dishwasher safe (excluding lid)
Designed for use with Maxtra
Brita Maxtra Filter Cartridges x 3
Enhanced 4-step filtration process
Improved lime scale reduction compared to Classic Cartridges