Okla. Admin. Code § 300:15-5-4
General requirements for purchases. Payment made by the public shall be at the time of purchase and prior to removal of the property purchased. A private business shall provide a business tax identification number and a tax exempt certificate, if applicable, at the time of payment. Otherwise, local sales tax shall be charged. Payment may be in the form of cash, certified funds, business check (not to exceed $2,000.00), money order, cashier's check or credit card approved for use by the Authority. Payments made by the public for property purchased through online auction (i.e. OMES Surplus Property and govdeals.com) shall be in accordance with the applicable auction website's payment methods and conditions for sale and pick up. All property sold at live auction must be picked-up by the buyer within ten (10) days following the sale.
Okla. Admin. Code § 300:15-5-4