I have several lenses to sell, and I'm trying to avoid eBay as they're not worth much.

They're all old MF only lenses. One is Pentax K-mount (Sigma 21-35mm f/3.5-4.2), the other two are m42 (Pentax 55m f/1.8 Super Tak and Industar 50-2 50mm f/3.5).

Currently selling the Sigma on Amazon, as it's worth the most, and I got quotes from KEH on all of them, but they only offered half of what I could get elsewhere.