1. Identify the buyer and seller in the agreement. My ultimate purchase and sale agreement designed exclusively for wholesalers and break it down for you.Set terms for wholesaler and retailer relationship. I have hurd people mention notorizing wholesale contracts and I would like to know if that is really necessary. Cooperative contracts require a vendor to complete another Form. I'm going to be showing you guys how to fill out a trek contract whenever you're wholesaling. Enrollment Form and an Employee Agreement.