The Timeshare Store has lower negotiated closing fees for smaller contracts, I believe. I've bought and sold through The Timeshare Store, and am a big fan of their professional service.
But having said that, I think it is much more important to look at the overall picture of a deal, rather than one small aspect of the purchase price. To me, finding a contract that will really meet your family's needs is much more important than trying to wring every last penny of savings out of a deal.
Think long term.