A group of counties may purchase items together under certain conditions. Refer to Chapter Eight, “Purchasing with Other Counties.”
19 O.S. § 1501(A)(3)(o)

Purchasing Heavy Equipment with Other Counties

The board of county commissioners is empowered to buy heavy equipment jointly with other counties and to loan or lease such equipment across county lines. Refer to Chapter Eight, “Purchasing with Other Counties.”
19 O.S. § 339(A)(9)(7)