Okla. Stat. tit. 12A, § 12A-2-304: Price Payable in Money, Goods, Realty, or Otherwise

(1) The price can be made payable in money or otherwise. If it

is payable in whole or in part in goods each party is a seller of

the goods which he is to transfer.

(2) Even though all or part of the price is payable in an

interest in realty the transfer of the goods and the seller's

obligations with reference to them are subject to this article, but

not the transfer of the interest in realty or the transferor's

obligations in connection therewith.