fleet bed difference/prices?

[Boog]

My short stepside bed has been sitting outside for over 10 yrs and rust has taken a real toll on it. The bottom of the front and both side panels are about too far gone to save without replacement metal. Fenders are ok, tailgate is also questionable.
I have been giving some thought to going with a fleetside lately and yesterday I looked a salvage yard over for truck parts. Numerous long fleets there and from a distance some looked pretty good. I won't be cutting one down however. I did find a fair looking short bed on a 71 truck. No large holes in the floor and no tailgate. Fenders feel solid. I cannot remember if it had the side marker or not.
Is there any other difference in a 67 fleet bed and a 68 to 72? I know a pic would help but what's a fair price for this bed I've found?
And there wasn't but one or two tailgates out there and all were trashed. Is there a shortage of good used tailgates? I'll have to go with a used bed as a MarkA (sp) bed kit is not an option. $$$ Thanks.