Well, Aquamarine International breeds seahorses indoors in aquariums, but they haven't been breeding kudas.
In the picture on liveaquaria's site, the stripped seahorse on the right certainly appears to be H. comes but the one on the left could be kuda or one of the types getting shipped as kuda.
If they really are estuary seahorses, then they won't look like the picture on the right.
Kuda is a catch all name that wholesalers/transhippers apply to many different seahorses. I think it makes it easier for them to get through customs and Cites.
I'd never buy a seahorse at 1/2 to 2 inches (their small size) and I'd be willing to be you won't find many, if any, at or near the 4 inch mark they claim the mediums can be up to (2" to 4").