I just got the lights off ebay, but check craigslist too.
I made a series of lowball offers on pallets of lights that hadn't sold for months until someone accepted. He was asking $50 ea, I got him to accept $20 ea if I bought them all and all his bulbs and all he had to do was throw them all on a pallet. Shipping wasn't bad under $200 I think.
I was really lucky to get new multitap warehouse ballasts for that price, odds are you'll only find used and probably closer to $40-50 but that's ok, it's still worth it. With all the places going out of business there's a slog of warehouse ballasts available out there and a very very small to almost no audience to buy them so if you can take your time and maybe make some offers crazy deals are actually possible.