Like rsvant said, going brand new would be very expensive.
I've got a set of carbs available for sale if you're looking for a replacement. I've replaced the diaphragms in them, as well as the air cut-off valves. I've also replaced the old plastic fuel inlets with a set of brass ones. I'm asking $150+shipping for them.
Though I would vote for rebuilding yours unless they are completely screwed.
......I'd rather wake up in the middle of nowhere then in any city on earth.
*2014 VN900 Custom (16,200 miles and counting)