Would you consider selling three or four of the supplements and possibly some of the adventures?
That would cut down on the shipping costs for me and leave you the bulk of the rest to still sell for more money.
Generally I have found that more money is to be made by selling items separately rather than as a bulk lot.
Hey man, I'm working on the house this weekend but I'll be available to post fairly regularly, if you've got time. That way we could wrap this scene up so hopefully the others could get back to posting.