A Bill of Sale from the out of state seller can be provided instead. 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.Complete the Motor Vehicle Vehicle Transfer Notification Form VTR 346. The form can be printed and mailed, or it can be filed electronically. Bill of sale of motor vehicle. For more information go to Texas Department of Motor Vehicles page featuring county tax offices. County of Harris. §.