Damn. They are really riping people now. They were 250 for both when they first came out. Than they were like 400 for a set. If they are $900 now Ford is definately trying to cash in. I wouldn't even bother with them. I was going to get them when they were $250 but they are alot of trouble because alot of them get broken during shipment and it would take atleast 3 different shipments to get a pair that weren't broken and now they are a rip off. They are only $450 as an option on the SVT. So yes they are a rip off.
The ones on E-bay are probably ones that were broken during shipment. The part that breaks can not be replaced because it's the actual bracket that screws on to your car. So if it breaks during shipment the whole assembly is worthless.