As title says really Lair on PS3 is 9.99. Also they have some other OK deals on some older games such as Folklore for 19.99 which is the cheapest I can find anywhere (that has it in stock). Also Ridge Racer 7 is 12.99 the cheapest price I could find. I know they aren't the greatest games in the world but the prices are good enough to take a punt.
Also Lair was posted for 9.99 at Argos but if, like me, your local branch didn't have it in stock this deal may be for you.