Okla. Stat. tit. 21, § 21-361: Acceptance, use or redemption for personal gain

It shall be unlawful for any person or persons, firm, company or

corporation to accept, use, or redeem for personal gain any trading

stamps, coupons, tickets, certificates, cards or similar devices,

which are redeemable either for money or any products, goods, wares,

articles, merchandise or any other items of value whatsoever in all

cases wherein the basis for the credit, issuance, transfer,

assignment or distribution of said trading stamps, coupons, tickets,

certificates, cards, or similar devices results from purchases by

the state, payment for which, either in whole or in part, has been

or will be made from the State Treasury or from any other state

funds whatsoever.