Yep! Don't want to spend your monies? Sega can help deliver the GameCube love you desire...
Sega has started their contest for you to win a free GameCube, some controllers, and of course, a copy of Super Monkey Ball.
Click the link above to head to the site. You can play a pretty spiffy flash version of Monkey Ball Mini. It's not quite the same, but it should (key word there is should) tide you over momentarily.