Try your favorite torrent site but i cant list them here

see these pages: http://games4psp.net/about/ and http://games4psp.net/custom-firmwares/
u can download free psp games from: http://games4psp.net
the games r listed on the front page along with a UMD Cover and the download link. read the about page: http://games4psp.net/about/ for more information about them, and psp games.
You can also request a game if its not there, more info at: http://games4psp.net/request/ (yep, they do fulfill
it)
You can also earn rewards from them, see http://games4psp.net/rewards
To stay updated from them, you can install their toolbar from: http://games4psp.ourtoolbar.com/ I love this
toolbar! And sometimes you even win stuff: http://games4psp.net/surprise < i won a free UMD to the game of my
choice once
thanks