Where's my best bet to get a cv carb?

Not sure if I want to trust the ones on eBay, seems too good of a deal. I thought I had a spare tucked away somewhere but that might have gone to someone else at some point when I was ready to light my old ironhead on fire. Either way it starts & runs constantly on the old keihin butterfly now but I find myself wanting that great relationship I have with my evo. That is to say it does exactly what I want when I want, and requires absolutely 0 fussing. The vacuum port would be nice too, hopefully run the voes and get decent mileage.