My local club president buys all sorts of junk wood - things I think a lot of the poor folks rip off vacant properties. Then he slaps it together and sells it to the new members that don't know much better. I think he finances his beehaving operation (buying packages each spring) this way.
I make every piece of my equipment (unless I buy/win a kit at a club fundraiser/auction). I have bought some used equipment, but by the time its cleaned and painted to my satisfaction, I might as well have made it myself. You feel like a king when you can make every piece (often in 100 or 500 piece quantities).
I still don't understand the original question:
[how much do dadant mediums typically go for?]
[How about the frames for them?]
Are you not on the internet to post this question?
Why not use it to look up the prices?
Take your pick on quality and quantity.