I was in Home Depot today and saw the Diamabrush angle grinder heads for sale in the tool rental department. The 4.5" was $66 and the 7" was $86, that's the cheapest I've ever seen them.
These are the cat's meow if you plan on grinding your floor prior to epoxy.
Craig
These are the cat's meow if you plan on grinding your floor prior to epoxy.
Craig