After a lot of thought I have discerned that I am never going to get around to building a custom rifle with these actions and should let them go to someone who will. I think I will go along with TC1's suggestion on pricing.
Where would be the best place online to market them? I am not much on using Gunbroker..
Why not put them up for sale in the classified section right here on the Campfire? No fee like the auction sites and a good audience of prospective buyers.
Good luck on your sale of the actions. I just had a matched pair built (25-06 and 35 whelen), but 7x57 and 9.3x62mm would just be too darned classy on those actions. I hope whoever buys them, buys both!