Tex. Gov't Code § 401.006

The committee may not make a contract covered by the competitive bidding requirements of Article XVI, Section 21, of the Texas Constitution unless before awarding the contract the committee obtains at least three bids. The committee shall award the contract to the lowest bidder who in the opinion of the committee is most responsible and is best able to fulfill the terms of the contract. The committee may reject all bids if none in the opinion of the committee is responsible and able to fulfill the terms of the contract at a reasonable price.