An "Agreement for Sale" is your promise note it says yep, I'll sell this thing to you, but later. Agreement to Sell and Purchase.The document is an agreement for the sale of land with a down payment between Manuel King Q. Gaerlan and Angelita P. Valdriz-Gonzales. Seller shall sell and convey and Purchaser shall purchase the property, together with all buildings and improvements thereon (collectively the. The UCC "fills in the gaps," providing controlling contract terms where the contracting merchants either didn't agree or just forgot to discuss the matter. Courts must "fill in" the gaps in the statute. (3) Where under a contract of sale the property in the goods is transferred from the seller to the buyer the contract is called a sale. Visible in our beautifully crafted interiors. You feel it in the heightened handling. A sales and purchase agreement (SPA) is a binding legal contract that obligates a buyer to buy and a seller to sell a product or service.