I would have put a spare tube in it when it happened (subtle hint) and a boot if you think the tube would poke through the hole. If money is tight I would patch the tire and continue to ride it. As long as the tube doesn't protrude when fully inflated you should be OK. It will likely be a magnet for future flats so it might be good to replace the tire and jump on the wagon for a while until your beer fund is replenished.