Tex. Business & Commerce Code § 621.152

Subject to Section 621.153(a), if the response to an offer exceeds the number of gifts or major or minor prizes, as applicable, available at the sales location, the offeror, at the time of the visit or, if a sales presentation is required, at the conclusion of the sales presentation, shall tender to the recipient of the offer a raincheck for the gift or prize represented in the offer. Except as provided by Section 621.153(b), the offeror shall send that exact gift or prize to the recipient, without cost to the recipient, not later than the 14th day after the date the recipient visits the sales location or attends the sales presentation. The offeror shall obtain a return receipt from the shipper verifying that the gift or prize was delivered to the recipient.