Whenever a state agency prepares an invitation for bid (IFB) for a contract for the purchase of goods, the cost of which is estimated to be in excess of $100,000, except a contract where the worksite will be fixed by the terms of the contract, provision shall be made in the IFB for a 5 percent preference for California based companies who certify under the penalty of perjury that no less than 50 percent of the labor required to perform the contract shall be accomplished at a worksite or worksites located in a distressed area.