Or go to a contractor yard or something, that's where I got my second refractor like this one. (the small one) Even though it was a little chipped, I at least got a new small refractor!
Was that the one you found the 250w lamp in tha 150w ballast? Contractors.... I'd try the ignitor first. If it's not that, then I'd go with a new capacitor before ordering a whole new ballast.
You gonna get a replacement ballast for it?