I'm sure everyone has heard of the famous Humble Indie Bundles at this point, but here's a cheap bundle that might have slipped under the radar. Groupees is running the Be Mine Anniversary Bundle which contains a lot of games in it for as low as a buck.
If you pay $1, you'll get Eschalon Book II (worth the dollar on its own for RPG fans), iBomber Defense Pacific, Livalink, Party of Sin, Major Mayhem, Dungeons: The Dark Lord, T82 Super Sonic Tonemaker, and four music albums. That's a lot of stuff for a dollar.
If you're feeling rich, you can spend $5 dollars and get everything above plus Men of War Assault Squad, Two Worlds II, Edna & Harvey: Harvey's New Eyes, Planets Under Attack, a mystery game, and two more soundtracks. You can also choose to donate 20% of the money to either Child's Play or Charity Water.