check these guys out, they have racks/rows of new take off beds/used beds for trucks of all brands. body lines changed in 82 so 82-93 box will work.

Langston's used auto parts
8011 N. Hwy. 301
Tampa, Fl.
(813)988-7341

Mon.-Fri. 8:00am-5:00pm
Sat. 8:00am-12:00pm

might check with the LQK (LKQ?) u-pull it here in Tampa also. I have saw a few good beds around in the JY here in Fl.

member Russ here on moparts in west central FL has some nice truck sheet metal. I have scored a couple cabs/beds/fenders/doors from him... he goes around to the swap meets so good guy to check with.

I know where a whole truck is cheap but would need to look the cab/bed over to see the condition of it.

maybe those will help out in your searching.