You can go to America's Note Network and post your note for sale on their free listing service.
http://notenetwork.com/Noteservice/ .
I have sold a few notes by doing this. They were hard to sell notes that no-one seemed to want but I found buyers who paid reasonable prices.
Your down payment is on the low side. 10% would be better. If you want to sell your contracts again, remember that the only way an investor can hedge his/her risk is too pay less for your note. Get more down from your buyer and you'll get more for your note.
Ben Innes-Ker
Motivated Seller