You have a few options...
If you have a hard drive...the arcade market place is your haven.
I find my self playing arcade games a lot.
If you don't have a HD get one...but if that isn't an option
There is an Arcade retail disc that is really inexpensive,
I would suggest you get it any way it's a steel...
Amazon.com: Xbox Live Arcade Unplugged: Video Games
And there is also a retail Tetris...
Amazon.com: Tetris Evolution: Video Games
Good luck and enjoy.
But know you will find every thing you could ever want on the 'Live Arcade'.