I bought some Ebay cross drilled, and slotted rotors for the Probe I just picked up as the wifes DD. The rotors on the car now are absolutrely screwed, and the ones on Ebay were the same price that AutoZone wanted for stockers, so I gave it a shot. The car has drums on the back, so I want some good stopping power up front. The big thing is the Zinc coating. If they don't have that, they will rust almost immediately, but the ones you are looking at have that as well. I haven't recieved mine yet though, so I can't comment on how good they are. I think those places just buy the same type rotors that the parts store gets, and drills, and slots them.
Brandon