The last four good, straight, takeoff tailgates that I had sold for $400 each. The last three that I had that were pretty badly mangled (would take more work to make straight than I would like to invest) went for $150-200 each.
If you can't make a deal on one close to hand, I'd go with a repro. I don't know about the others, but I can say that Sheldon at JeePanels Plus makes a nice unit and delivery is free to a show that he is attending... He was charging $400 for his last time I checked...
I'd have to put one a scale to find out the weight. It's been too long since I shipped one. I can say that you can ship them "naked" by UPS and save $$ over putting them in a box (and they arrive in better shape, actually). Just slap a label on it and hand it to the driver. It's easier for them to handle without the box since they can grip it better, and they can see what it is... And you don't have to pay for the box and padding...