What price would constitute cheap?
Don't get upset, but this is just simply my opinion...
Cheap would be $300 or less for just a bare action with a trigger (no bottom metal, and no mag box assembly). The last stainless/jeweled one I bought I paid $200 for it, because the guy was getting divorced and had to sell it or else his wife got it. He said he'd rather sell it and lose money, than for her to get it. LOL
Reasonable would be $300-325 for a used action (no bottom metal, and no mag box assembly).
I based that off the fact that I can go buy a new 700 ADL special from Academy, Dicks, or Wally World for $379.99.
The last used blued 700 ADL I bought was strictly for the action, and I paid $350 out the door, so about $315 before tax.
This is also just one person's opinion based on what I've paid, and what I'm willing to pay for one. Some people might be more desperate, and might be willing to pay more... It's hard to tell what the current market is going to allow you to sell them for.