I would start by searching google and see if any vendors come up that have it, if there are check here to see if people think it's a good vendor. I come up with UK vendors if I do that here (and it's not listed).
If you can't find it that way try contacting one or more of the good vendors and asking. Here in the UK they will sometimes say 'no but try so and so' and give you another vendor to try. Here in the UK the vendors all tend to know each other quite well and know who specialises in certain types of things so can direct you to the nursaries that specialise in the right thing (not sure if that's the same in the USA).
Sometimes if none of them have it, one will offer to keep an eye out for you, or they will advise if they think it's a difficult one to find.
Sometimes hybrids go in and out of fashion. I had one I really wanted to replace one I killed. When I got the first it was everywhere and every vendor had them for sale, a few years later no one had it. What they explained is that someone will grow a batch of them and flood the market, then they'll move on to something else, and so you get these fashions where something is at every vendor, then later they become really few and far between, if you can find them at all. It's worth a try speaking to the vendors though.
Then if all that fails it probably is a case of keep your eyes open at shows just in case it turns up.
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