Fresh fruits and vegetables prepackaged and offered for sale at retail shall be made available in small quantities upon customer request. A prominent and conspicuous sign reading “small quantities of prepackaged fresh fruits and vegetables are available upon request” shall be displayed. Such sign shall be located not more than thirty feet from the prepackaged display. The commissioner shall adopt such rules and regulations as are necessary for the proper application, administration and enforcement of these provisions. As used in this subdivision, “small quantity” means an amount, by weight or volume, smaller than the amount offered for prepackaged sale.