Most commissions appear to be around 10% and most often the estoppel fee is also paid by seller. After that, dues and closing costs are negotiable. We've always been a buyer, never a seller, and have paid dues, paid prorated dues, not paid dues. We have always paid closing costs.
The prices seem to vary by reseller. Which is interesting. I imagine the higher priced resellers see more negotiation than others. I can only speak to BLT as that's all we really watch, but some sites are pricing $118 - $123 others seem to be $130 - $140.