§ 2040-a. Contributions to school districts containing migrant labor camps. Notwithstanding any other provision of law, and for the purpose of sharing the extra expense incurred by a school district in providing temporary educational facilities for children living in a migrant labor camp located therein which supplies labor to employers residing in other school districts, the board of education, trustee, or trustees of any adjoining school district, or other school district in the same town, where employers residing therein are supplied with labor from such migrant labor camp, may contribute not more than three hundred dollars annually to the school district in which such migrant labor camp is located. The moneys so contributed shall be used only for the purposes hereinbefore stated.