Magnepan SMGa - what are they worth, best places to sell?

I inherited a pair of 1986 SMGa in good working order. As I am content with my 1974 Advent smalls, I inclined to sell these. Seems eBay has them from $400-1400 per pair. Locally on Craigslist, they are priced lower.

Do they have a strong following. Can you guys give me any suggestions?