The good 10 amp dewalt grinders are around $100. If you watch Rural King, they go on sale for around $60. Also dewalt cut off wheels sell for $2, on sale at RK they are $1. That's when I buy a box of them.
I bought a few cheap HF grinders and I made two trips to HF, one to buy them and one to return them. Look at the amps they use, the more amps, the more power. I like power. The disks at HF don't last like the dewalts do. Guess you get what you pay for.