I second orchid shows when possible; even if those groups aren't close enough for you to want to join any, bookmark their homepages and keep an eye out for any shows or auctions, they are worth the drive. Bigger shows may attract vendors from across the country or even the world; smaller ones will usually be local vendors who should have conditions similar to yours and whose plants should be happy with you. Just check with the vendor about an unfamiliar plant's needs.
I have bought off eBay quite sucessfully in the past- I'd just check the vendor's feedback. Good nurseries sell there, but so do the so-so ones and Joe Blow with a plant on his windowsill he really knows little to nothing about. If in doubt, don't buy.
If you know a plant you're interested in, try Googling '(its name) sale' and see what pops up- even just search the name.
It would be great sometimes to be able to purchase internationally, the plants I want most are not that common here in the US it seems, though they are common elsewhere and not restricted in any way that I know of- actually, seems if I see one for sale locally (rare), it's as a NOID at a big box store.
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