The last pair I saw sold in person went for $3000, and they belonged to an original owner car! There was a member here that found some on eBay late last year and got them for under $1000.
The funny thing about science is that if you change one miniscule parameter you change the entire outcome to the way you want it.
There was a member here that found some on eBay late last year and got them for under $1000. 
