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If you are like me and don't have an air table, and don't want to fork over about \$800 to Sargeant-Welch to get one, you can substitute a “hover puck” aka “air puck” aka “hover soccer” for about \$12 at some place like Toys R Us. Runs off rechargeable batteries. If you really have to use a science supplier, Carolina Biological has them for $35.

They look like this:

and run for around 10 minutes or so on a full charge. For that reason, I have three. I use a stick-on hook from the hardware store to tether it.