Okla. Stat. tit. 28, § 155
In addition to the flat fees herein provided for, the clerk shall require such additional deposits from time to time as might be needed to pay witness fees, appraisers' fees, mileage fees, or other authorized expenses.
Laws 1968, HB 1174, c. 359, § 5, emerg. eff. July 1, 1968; Amended by Laws 1971, HB 1104, c. 105, § 4, eff. October 1, 1971.