Thought i'd post this as a tip as opposed to a deal as apparently preowned games aren't allowed as deals.
Basically i frequent quite a few different blockbusters, all of which seem to have both Bioshock (normal and tin) and Halo 3 both now on the 2 for £40 (and literally 20 copies of each per store). If you are a member you should have recently rec'd the xmas mail out which has 10% off voucher in the back making it only £36 for these 2 cracking games!, preowned has 1 year guarentee etc.
Half life 2 Orange box is also only 29.99 preowned, using the card this equals a decent 26.99.
Anyway hope someone finds that useful!