Oklahoma counties use multiple purchasing methods with bidding required for purchases over $25,000 and defined roles for purchasing officials.

County bidding includes online and sealed bids, vendor quotes and common bid lists managed by the purchasing agent under Oklahoma law.

County purchasing methods include blanket purchase orders, rentals and leases, emergency purchases, credit cards, cash vouchers, joint purchasing and purchases under $25,000.

Reverse auctions allow Oklahoma counties to obtain goods and services through real-time online bidding where vendors compete by lowering prices.