They aren't all that expensive and are a very useful tool to have. The "Dremel" branded one of course is better, but if you want one on the cheap grab the Ozito branded one. That's what I have and it works well enough for the occasional use.
What I do *highly* recommend is that you buy the dremel branded accessory kit. Basically it's a box of bit you will most likely never use, but when you look at the price of cutting discs alone, the box is quite attractive and those other bits do come in handy from time to time.
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