Recaro Seats For Sale

Do these come up much for sale? I'm currently after a set :/

Do they fit on the Subframes I already have (standard 197 seats) or do you have to get the recaro Subframes too as a set?
 
They pop up every so often. There might even be some still up for sale now. I think you need different sub frames, but I'm not sure.
 
subframes are built in - straight bolt in swap apart from the air bag system
 
I have a set for £750, only bad thing is they have slight bolster wear on the drivers seat. Other than that they would be immaculate