wheel - 11:33 am on Nov 29, 2011 (gmt 0)
I would get a professional sales person to negotiate the sale.
There's no magical professional sales person, and there's precious few techniques even if you found one of those unicorns. And I'm speaking as a professional (and successful) salesperson.
Sales is little more than hard work and a willingness to contact people. And in this case the negotiation and contact are already started. Why pay 30% when all that's left is an email or two?
Heck, if that's the case then PM me, I'll do it for 30%. I've negotiated 6 figure site sales before using my insider secret sales techniques that I can't tell anyone about publicly (OK, I'll spill. It involved calling a company that might be interested and saying 'we're thinking of selling, are you interested?).