BGF has some of the CNS v.1 carbs on eBay. The difference between it and the V.2 are night and day. Fully adjustable and with a enrichenment circuit that works there's no comparison with an NT carb. It does have to be the V.1, though. The V.2 is junk and that's the most polite thing I can say about it. Red air cleaner = red flag.
At between $40-50 other options should be looked at, too. Dellorto's and Mukuni's leading the list.