We could bring machines, trade for trucks,, ha Seems beds would be about the same everywhere but anything from here would be rusted, new would make more sense. Yes, building one off can be slow especially if a guy wants some custom fancy features. I see some at a dealer a while back I would be almost be tempted to use as a starting point, save a lot on the bending, etc, just things a guy has to sort thru if its not something he does every day, things you got to live with because you didn't have this or that "right"
To some extent I can understand a fabricator buying a bed,, he is busy, maybe doesn't have time and place, lots of things can make it time consuming. I rarely buy and sell equipment but seen a couple 200's I might score recently, I haven't looked to see what the market is for them, saw a 400 while back but it would have to be near 4 free for me to have interest.