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Seriously, $20 can net you 5-6 games easy, pretty new ones too.
You need a free steam account to buy them. best thing about steam is as long as you keep your account info you'll never have to worry about loosing your games.
On my recommend list.
Audiosurf
http://store.steampowered.com/app/12900/
World of goo
http://store.steampowered.com/app/22000/
Evil genius
http://store.steampowered.com/app/3720/
Cogs
http://store.steampowered.com/app/26500/
Osmos
http://store.steampowered.com/app/29180/
Plants vs Zombies
http://store.steampowered.com/app/3590/
Games under $10
http://store.steampowered.com/browse/under10
Games under $5
http://store.steampowered.com/browse/under5
You need a free steam account to buy them. best thing about steam is as long as you keep your account info you'll never have to worry about loosing your games.
On my recommend list.
Audiosurf
http://store.steampowered.com/app/12900/
World of goo
http://store.steampowered.com/app/22000/
Evil genius
http://store.steampowered.com/app/3720/
Cogs
http://store.steampowered.com/app/26500/
Osmos
http://store.steampowered.com/app/29180/
Plants vs Zombies
http://store.steampowered.com/app/3590/
Games under $10
http://store.steampowered.com/browse/under10
Games under $5
http://store.steampowered.com/browse/under5