Tell them to give you 10% NON-REFUNDABLE Earnest money up front. YOU or your Closing Attorney need to draw up the Contract to suite YOUR needs!! Word the Contract stating a Closing of 2 weeks after receipt of the earnest money with full payment due upon closing. Require both earnest and final $$ be in the form of a Cashiers Check. They need YOU more than you need them. I've bought and sold several tracts in the past 10 years.....