Create a free Sales Agreement in minutes with step-by-step instructions. A Sales Agreement legally documents the purchase and sale of goods.General Applicability. This MASTER SALES AGREEMENT (this "Agreement") sets forth the terms and conditions. A master purchase agreement is a legally binding contract between buyer and seller, and typically relates to buying and selling goods rather than services. Requirement. Description. Certified. Complete. By. Contract, Exhibits. Consideration in the selection process to fill vacant positions. Apply to any SUNY college or university through one easy form.