$250 was for the entire sander ("hog" "bondo buster" whatever he called it) Not just the disk. I'll see if I can get a pic of it tomorrow, the guy I work with has a few of them. One of them basically looks like a regular DA sander except instead of the small offset weight between the motor and the pad it has a large round probably 4" dia. weight along with the 7" disk. He says they (entire unit) cost him $250, of course who knows if he was exaggerating or if that is the real price. I just wrote what I was told. Has anyone ever heard of one of these?