Okla. Stat. tit. 20, § 15

In each case filed in the Supreme Court and in each application seeking reinstatement to the Oklahoma Bar Association, and at the time of filing same, there shall be deposited with the Clerk as costs in said cause Two Hundred Dollars ($200.00) of which no rebate of any part thereof shall be made; provided, the Supreme Court may prescribe by rules the procedure for affording access to that Court, without the deposit of costs, to those indigent persons who are deemed by it entitled thereto.