Ive seen somewhere on here that they're £30 each inc VAT. Matching some black to my wheels from local paint shop and getting a friend who sprays to do it for a drink. I was tempted to just paint origionals as I dont think i'll be chanching back 
See if I took the plunge, I think I wud get the covers just in case I fancy a change from time to time, similar sort of thing with winters & summer wheels...