I tried to sell my GY SR a's with only 8,000 online for $175 and had no luck what so ever. I wound up trading all 5 in for a crappy used 285/70 MT for a spare. I offered them to a coworker who had a 07 wrangler for $100 bucks and she turned them down. 3 months later she bought new SR A's for $600. But as for other take off parts, ie: stock bumpers, rims I've done pretty good on craig's list. Had a guy from Jax come all the way to Daytona to buy my front bumper.
Check some of the used tire places. Generally they're in the seedier parts of town. Ha, OBT may be a good place to start. Good luck Amigo.