A purchase and sale agreement is a contract between a buyer and seller for transacting a property in exchange for a specific price. A purchase agreement is most commonly used to create a transaction between a buyer and a seller of residential real estate.Curious about the paperwork for selling a house without a Realtor? Download our free blank purchase agreement template in Word or PDF format: sample real estate purchase agreement template. This FSBO paperwork is needed as soon as you accept an offer, so it's useful to have a purchase agreement onhand that you can fill out quickly. We'll make our choices, check the boxes and fill in the blanks. A purchase agreement is a form used for making an offer on a home. It contains a set of conditions and contingencies that are presented to the seller of a home. These blank forms are very cheap or free. If you know what you're doing, then you can fill it out correctly.