Tex. Gov't Code § 2156.062
An open market purchase shall, to the extent possible, be:
Added by Acts 1995, 74th Leg., ch. 41, Sec. 1, eff. Sept. 1, 1995.
Amended by Acts 1997, 75th Leg., ch. 1206, Sec. 15, eff. Sept. 1, 1997.