Try Kragen auto parts. I have a dremel, but at work i have a cheap no name "Nikota" i got from Kragen for $20 with a number of bits ! I hate to say it, but i really can't say the dremel is any better. I've had 2 other dremels break on me, and while this Nokita is only a year and 1/2 or so old, it's still running great after a good amount of use. And since you say you'd use it very little it would probably outlive you ! Actually it won't, because once you own a dremel you will find many uses for it and won't wanna be w/o it.
Anyway, not sure if they still have them at Kragen or if they do whether the price is the same. But if not check the other chain stores including non-automootive like target and such. I guarantee you can find a much cheaper brand of rotary tool than dremel.
