When is a junkyard not a junkyard?

I've been trying to find a used replacement frame, and it quickly became apparent that most of what I find online are not actual wrecking yards but brokers claiming to "have" the truck in stock. I have found one promising truck, and the same VIN is listed on various websites at different prices. Has anyone else encountered this? Any ideas on how to find out who actually has the truck in their yard? I'd rather just deal directly with the folks who actually have the truck.

 

https://www.car-part.com/ Worked really well for me and never had a fake listing.

Loooooads of frames for sale here, under 1500$

 

It looks like car-part isn't immune to the problem. I've found the same truck offered by a wrecking yard in PA and another in MI and a third one in IN. Schrödinger's Tacoma.