Total cost $18

Thank you sir. It was a lot easier than I thought it would be.
Here it is:
1" Stir Bar http://www.amazon.com/gp/product/B002VBW5HM/?tag=skimlinks_replacement-20
Computer fan with speed controller http://www.amazon.com/gp/product/B00066ISVG/?tag=skimlinks_replacement-20
Rare earth magnets http://www.amazon.com/gp/product/B001KV38ES/?tag=skimlinks_replacement-20
(optional) Erlenmeyer flask
I used a spare project box I had for the container, but a cigar box etc would work. If you want a more detailed description of the actual process let me know. I also used a spare 9v dc adapter I had lying around. Even the fan and earth magnets can be found in an old computer tower, knocking your price down to a whoppin' $5.45 for the stir bar.
You can make it as fancy as you want (an actual speed controller, on/off switch, led indicator, etc) but for my purposes this works just fine. Its on when its plugged in and off when its not haha.
@aprichman