Buy with Prime can take the headache out of fulfillment. Buy with Prime lets you display the Prime logo and delivery promise on your own website.The Contractor shall submit a schedule of cost to the Contracting Officer for approval within 30 calendar days after date of receipt of notice to proceed. Fannie Mae offers expert guidance and insight into the homebuying process, your mortgage options, and what to expect along the way. A prime vendor agreement is an agreement between a business and its suppliers that are considered essential for the company's operations.