Home DePot has em for sure. I'd say, if you have the time, stop in at a store near you and pick up some big 150w=42w cfls. I have 4 of them on 2 plants right now and the plants are doing great. You will need to buy replacement cords and sockets, too. The bulbs are about $10 a piece, ceramic sockets are no more than $3 as well as the cords. Get some electrical tape too, to seal up any exposed wires..