Well soft top frames seem to be for sale on ebay all the time for $3500 or so, but I've never actually seen one sell. I think if you NEED one they are worth a lot, but that if you HAVE one that no one needs, it isn't worth that much. At least that seems to be the experience I am having with my left and right 190SL doors and hood, and the experience I HAD with a 107 hardtop that finally went for $100. You can find plenty of 107 hardtops on craigslist ranging from $300 to $1000.