If you have access to an old computer to scavenge. You can build a stirplate for less than $10.
You need a box. I used a wood cigar box that I already had.
Remove the fan from the computer.
Remove and open the hard drive. You want the magnet from the read/write arm.
Glue the magnet on top of the middle of the fan.
You then need a power supply. I had one from an old answering machine. It is the box thing that plugs into the wall outlet.
At Radio Shack you can get a rheostat and knob.
Mount all this in the box and you have a DIY stirplate.
You will also need a stirbar and a flat bottomed vessel/flask.
There are instructions on this site and videos on YouTube.
It is well worth doing.