I'm a sucker for bargain bin games and try to avoid paying full retail price when possible.  There are many great games to be found in the used game sections of GameStop and the prices of many classics are $20 or less.

For my birthday I got a used PSP 3001 for $50 and the came with Fifa 2009 and a UMD movie Treasure Hunter 2.  I had to buy an AC adapter for it.  So $65 out the door with a game and a movie isn't bad.

Since I don't play sports games I traded in Fifa 2009 and took advantage of GameStop's recent buy 2 get one free sale and picked up.  Jeanne De'arc, Final Fantasy: Crisis Core and Patapon 2.  All of these out the door was less than $15.  We went back the next day and picked up Parappa the Rapper for $6 and Lumines 2 for $5.  My last purchase was Half Minute Hero for $10 out the door after using a 20% off coupon I got for my birthday.

We also got two free games from the PSN Welcome back pack (Kill Zone and Little Big Planet)

So a system, AC adapter and 8 games for $101..not bad at all