Oh, you're in luck - the highly popular HF 4 1/2" is on sale ($9.99):
http://www.harborfreight.com/cpi/cta...emnumber=95578

Some people claim that this (blue) is a POS & you should get the yellow
(?) $19.99 one, but this one's going fine for me.

For the price of a Milwaukee, you can get 10 of these.

Bob