We also have a 1975 24' Argosy. What a wonderful trailer! They do sell for a lower price, but no one has ever made any disparaging comments because it's not a silver Airstream.
We found ours on the Oregon Coast; the PO lived in it while he built his new home. Once the house was done, he was ready to sell it. It was in pretty good shape; we had to replace the cushions, upholstery & curtains before we could camp in it, but he let us have it for $2800! Can't imagine life without it now.
Good luck with the search - your trailer is out there waiting for you!
Sean & Sharon
AIR #: 27389
TAC #: OR-3