Could someone give me a source to acquire small ballasts for MV & MH lamps (<200W)? Maybe similar to these from the gallery. I've got some of the these lamps but nothing to light them.
Your best bet would be to go to a hardware store and purchase a cheap fixture and take the ballast out of it. Otherwise you might find one online through a supply house but the price tag will probably be high (>$60). Mercury vapor might be difficult to find at this point but some smaller hardware stores might have leftover stock in them, esp. of the 175 watt variety. I know that WalMart sells a small MH fixture for less than $50.