http://www.harborfreight.com/cpi/ctaf/displayitem.taf?Itemnumber=91223

I buy these when they come on sale for 9.95 .  I open the gearbox, and fill it with synthetic grease. So far they've lasted over 5 years, and are still working. They bog down easier than my Makita, but they are also lightweight and easy to move around. I've cut through 1" square tubing with them, ground welds, put a wire brush on them, and generally been pleased. I pay more than this for a good lunch. I have 3 of them with different attachments on them. I never have to diddle around with changing from cutting wheel to brush etc. I also have a 100 dollar Makita, which I never use.
Courtney