I picked a few of these up myself, and was originally posting this in another thread, but it's all so good right now, I thought i'd point it out here too. If you want to get into collecting for the PSP, now is the time. Racing, puzzle, platformers, action, adventure, RPG, sports; it's all here. Amazon has all these games new and eligble for prime shipping. They also have a promo where you can waive the 2 day prime shipping (get 5-7 days instead) and you'll get $1 (per item ordered) toward any book/ebook purchase on amazon.com.

Disclaimer: Amazon prices often fluctuate (sometimes better, sometimes worse)

Parappa the rapper $5.99
Valkyrie profile lenneth $12.99 (remake of PS1 classic, much cheaper)
Wipeout pulse $9.79
Final fantasy iv complete $14.29
God of war ghosts of Sparta $9.49
Third birthday $9.05 (parasite eve trilogy)
Tactics ogre $11.97 (another PS1 remake, again, much cheaper)
Castlevania Dracula X Chronicles $11.53 (has remake of Rondo of Blood, original ROB, AND Symphony of the night)
Metal gear solid peace walker $11.30
Daxter $7.68
Socom FTB AND symphony filter dark mirror $4.95 (FOR 2 GAMES!)
Patapon and Locoroco $7.85 (another 2 pack)
Fate/extra $10.98
Twisted metal head on $7.28
Socom FTB 3 $7.31
Fat princess $4.93
Patapon 3 $9.99
Wipeout pure $6.99
Secret agent clank $7.46
Monster hunter freedom 2 $11.99
Chess master $2.24 (what? How could you not)
Mod nation racers $9.99
Syphon filter Logan's shadow $8.40
Pixel junk monsters deluxe $6.95
Lemmings $7.20
Hot shots open tee 2 $4.87
Motorstorm arctic edge $9.29
NBA 10 $3.75 (if you're into that kind of thing)
Socom tactical strike $4.98
Kill zone liberation $8.75
Pursuit force 2 $8.99
Untold legends $8.52
Breath of fire III $14.89 ( European/japan only release)
Tenchu shadow assassins $9.99
Brothers in arms d-day $10.99
Brook town high $4.99 ( not good but cheap)
Ape escape academy $7.79
Hot shots tennis $5.99
Crazy taxi $10.94
Rengoku 2 $4.99
Alien syndrome $4.84
The con $4.99
Hot pixel $6.59
Buzz master quiz $4.93
Adventures to go $8.43
Frantix $4.99
PQ 2 $7.95
Puzzle chronicles $5.99 (puzzle quest ripoff)
Kingdom of paradis $7.99
Secret Saturdays beasts $4.99 ( no clue)
Soul caliber broken destiny $10.00
Murcury meltdown $5.99

To put that in perspective, that's 55 games for about $400 shipped, plus $53 in amazon book/ebook promo money. All in all, thats less than $6.50 a game, and that includes most of the bigger name titles. A few of them aren't that great but they are so cheap I listed them anyway. They also have some more cheap (under $10-15) import titles as well. PSP is region free and a rather underrated console in my opinion. Sounds pretty good when you don't have to worry about condition or watching auctions. You can just sit back, read a free book (or 5), and wait for a couple big boxes to come in the mail.