Okla. Stat. tit. 14A, § 14A-2-403: Certain negotiable instruments prohibited

In a consumer credit sale or consumer lease, the seller or

lessor may not take a negotiable instrument other than a check as

evidence of the obligation of the buyer or lessee. A holder is not

in good faith if he takes a negotiable instrument with notice that

it is issued in violation of this section. A holder in due course

is not subject to the liabilities set forth in the provisions on the

effect of violations on rights of parties (Section 5-202) and the

provisions on civil actions by Administrator (Section 6-113).