Well, I went to Home Depot and Lowe's and they both had the appropriate ballasts, but not the endcaps that would accomodate a 4-pin bulb. I also have no idea how to hook up the ballast if they did have them. The ballasts I saw had 4 wires (I guess to accomodate 4 bulbs), but I wasn't sure what I'd do with the extra wires, once I had it hooked up. Would there even be extra wires? I think I"m just going to try my luck on ebay an purchase a complete ballast system that's already put together. That way, I'll already have everything I need; ballast cords, endcaps, clips, etc.