Hi there fellow Central Ohio Buckeye!
Another decent local orchid buying spot is Trader Joe's...both locations in Easton and Dublin. Depending on the season, you can find any number of interesting and varied orchids in their stores and they are usually very reasonably priced.
Almost forgot...also...Franklin Park Conservatory! You can usually find both in bloom and past bloom specials in their gift shop. And their annual "retired orchid sale" happens after the orchid show each year.
And, even though you know about the Central Ohio Orchid Society...I'd be remiss if I didn't mention that our shows and meetings are almost always a great place to pick up some new orchids. Members share divisions and rehome plant with each other plus we have member plant sales as well as our speakers typically bring plants for sale. And, our show each spring is always an orchid addict's paradise.
BTW - Kristen Uthus of New World Orchids will be our speaker in September (the 17th) and she'll be doing a travelogue on her recent trip to Japan for the Orchid Grand Prix back in February plus she'll be discussing the culture for many of the plants. And, of course!, she'll have plants for sale.

Hadley Cash of Marriot Orchids will be our speaker in October (the 8th). Just throwing it out there in case you can make it.