In addition to the Breakdown deal listed below, Best Buy is also offering a number of other titles for $4.99. The other $4.99 titles are

Castlevania: Classic (GBA)

NCAA Football 2005 (Gamecube)
Scorpion King: Rise of the Akkadian (Gamecube)

Astro Boy (PS2) (Trade-in value is $18 at Fye/Wherehouse.com)
NBA LIVE 2004 (PS2)

Crash 'N' Burn (Xbox)

Deals are available online and in select stores while supplies last. If you are trying to pickup the PS2 titles in stores, you can also use the $5 off any Playstation 2 or PSP game coupon and the games will be free (except for tax).