§ 163-a. Contracts with Green Thumb Environmental Beautification, Incorporated. Each state department, agency, board, bureau, commission or other unit performing governmental functions for the state, within amounts appropriated therefor, may contract with Green Thumb Environmental Beautification, Incorporated, a nonprofit organization that is organized for the purpose of environmental beautification and employs persons fifty-five years of age or older whose annual income does not exceed: (1) two hundred fifty percent of the non-farm federal poverty level applicable to a family of one (as defined and updated by the federal department of health and human services) for an individual living alone or in another person's home; or (2) four hundred percent of the non-farm federal poverty level applicable to a family of one (as defined and updated by the federal department of health and human services) for a couple living alone or in another person's home. The contract shall name the organization, the amount and manner of payments for the service to be rendered, nature of such service, the rendering of a verified account of the disbursements with verified or certified vouchers therefor attached, a refund of any unused amount, and such other conditions upon the use thereof as may be deemed proper.