This excellent and very inexpensive Dremel compatible rotary tool is on sale again
by Mark Frauenfelder from on (#4P06T)
I've been using this Wen rotary tool for a couple of years now and I really like it. It has plenty of power (I've never turned it up to full speed for anything I've used it for), comes with a bunch of tool bits, and costs a tiny fraction of the price of a similar Dremel tool: $12.88 on Amazon.