LittleBigPlanet (EU Version) - £17.99 shipped ($32 US)
I've bought imports from this site recently and they have all arrived quickly.
All PS3 games are region free, so this will work on a North American console. I'm not 100% positive that all the network features work in different regions, but if someone could confirm the status of that it would be appreciated. From what I've found online, it appears that the online play is not region-locked, so it should be fine... but like I said, I'm not 100% on that.
Edited by shipwreck, 18 December 2008 - 01:13 PM.