Here are some ways to identify a vendor's specialty:
1) Before you go to the show, look at the Orchid Society's website or google the name of the orchid show (with '2014” to get a list of vendors). Then, check out each vendor's website and see what you can glean from it. Usually, it is rather clear just from what the vendor sells. Further hints? If the site advertises flasks and talks of possible characteristics the seedlings might have, the vendor probably made the cross and is rather fond of that type of orchid. Same if the vendor has a bunch of unnamed crosses of a certain type of orchid.
2) You can also start a thread about the show here on Orchid board and ask if anyone knows what each specializes in growing. That might be the easiest way.
3) Look at the vendor's display. When I was working at our show this year, I easily knew which display belonged to which vendor simply by what they had placed in the displays. The vendors were showing off their favorites.
4) Chit chat with one of the Orchid Society members at the show (Membership table). Tell them what type of orchid you like and ask which vendor/vendors raises that type of orchid. Or, if they don't know (they might be new), ask them who could tell you.
5) Join an Orchid Society. You will quickly learn where everyone finds their orchids!
If anyone else has any other ideas.....
---------- Post added at 07:48 PM ---------- Previous post was at 07:45 PM ----------
When buying an orchid not in bloom, ask whether it is blooming size and how large the orchid will become.