Local supply company has stocks of M57 (fires 175 wat bullbs) and M58 (fires 250 watt bulbs) ballasts for $52 and $56 (Mogul sockets $14.00 crap bulbs for $14.76 probably 4k). They are also able to get MH bulbs, they can order Ushio, and may be able tog et other brands as well.
Let me know if you are interested.