Sony Alpha DSLR-A850

I have some used Alpha camera's to sell but have no idea as to what I should price them at. Does anyone have a good resource for valuation. I have some that are fairly new, some that are just for parts, some that are about half through their useful life. I also have 10 lenses to sell as well.  Thanks for the help :) --Aloha from Maui!

Hi all, First time poster here and 2 year Sony user! I already have an a77, and a55 with a couple of lenses. But I saw an second hand a850 for sale bundles with a second hand 100mm f2.8 for $1090 Is that a steal? I haven't checked out the body myself though...