Visit businesses in your area/city/country, meet owners/managers, handover postcards and reveal all the benefits they will get:
1. Free Webpage. 2. Free listings of unlimited products. 3. Exposure to millions of affiliates. 4. Secure Payment. 5. Only a small commission of their own choice they have to pay to SFI after sale.
Then make some follow-ups until they are convinced or ready to join.