Easily the cheapest in the UK, I think there is one shop doing the same (but it's only done if requested by price match or something), but why give another store the credit when the first store has put the time and effort in to charge this bargain price all the time?

all-in1 Unflavoured Whey Protei more...

Quickly!

http://www.jellybelly-uk.com/

Click samples at the top of the page.