You sometimes hear of people using things like lumpy mail with coins taped to the top, fedex envelopes etc to get people's attention. 

What about the concreteness of what a sale looks like and could mean, represented by a draft purchase and sale agreement? 

Stated price could be left blank with a "call for quote." Or a sample figure could be used, derived from a percentage of the Zillow Estimate or similar.

One could word it to be a sort of first round offer, or simply put somewhere that it's subject to a serious discussion to determine actual value. 

For getting attention I'm curious if others have tried something similar to this and whether the draft agreement is a decent call generator.