I've been thinking about this lately. With the MVS collectors market really starting to take off, even a lot of operators are storing the goodies away and selling "Full Kits" on ebay. I think the days of the cheap loose carts are ending. Sure there will be a few, but now that people see there is value in these kits... arcade ops who are looking to sell off boards know what the people on ebay want.
Oh and the price is starting to come down, Coinopexpress has them for $179 right now,