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Are you asking how much it would be to have someone take the body off and put it on the ground next to the frame, or to take it off and deliver it to a body shop to be finished? I'd bet that it would take a full day to do this for the average guy, so maybe $500. If you're willing to take off the flares, seats, seatbelts, etc I'm sure it would get cheaper. This whole process is really just a bunch of easy tasks that team up to be a good sized job.
I did this myself when I was in my 20s, and was surprised at how straight forward it was. You just have to unbolt everything from the old tub, unbolt (or cut off) the body mounts, and remove the dash (and I believe the steering column). The hardest part for me was lining up the three other guys to help lift the tub off and move it.