(DS)
Cooking Mama (yeah, that's really the only decent title)
I don't have a PSP, but here are games I figure might be decent:
(PSP)
Scarface
Atari Classics Evolved
If you just go to HMV.ca, click Games, click the system on the left side of the screen that you want to look at, and then click "(system) Games", click "Best Sellers - See All", and then choose to sort from Price Low to High you can see all of the titles. There aren't a tonne of great ones, but there's a few.