Though standard form bill of sales are available online and from your local county tax collector's office, it's also perfectly acceptable to write your own. County of Harris. §.Learn about bill of sale laws and requirements for the state of Texas. Get templates for buying and selling high-value items like cars, boats, and firearms. This form may be used to legally transfer the ownership of a vehicle from one (1) party to another. A motor vehicle bill of sale is between a buyer and a seller of a car, truck, or motorcycle. It is signed as the last step in the sales process. Download Texas Free Bill of Sale template, modify and send for signing using BoloForms Signature. A general bill of sale form is a simple, receipttype form used to document the sale of personal property.