Where to get PS3 games on the cheap.

From my experience I would say Kinguin is the best for buying console digital downloads

Well you can use some online shops like rakuten.co.uk, thehut.com, zavvi.com, even amazon. The playstation store has often nice games (right now easter sale), gamestop has some rare good deals but the most effective one is: Mall surfing, check all the electronic stores, they are starting to sell stuff at very low prices so they can get space for the new generation of consoles.

Craigslist is your friend.