Ind. Code § 5-2-2-12
The commission shall not enter into any contract for the purchase or sale of any material or supplies or for the performance of any work or labor other than the salaries of employees, when such material, supplies, work or labor costs are more than ten thousand dollars ($10,000), without first giving notice of its intention to purchase or sell such material or supplies, or to contract for such work or labor, by publication in some newspaper of general circulation printed and published in the City of Indianapolis, for two (2) successive weeks prior to the time fixed for the letting of any such contract or the purchase or sale of such material or supplies. All such contracts shall be in writing and the other contracting party shall be required to furnish bond for the faithful performance of the terms of such contract, in such amount as may be fixed by the commission and with surety to its approval, and conditioned upon the faithful performance of such contract.
IC 5-2-2-12