Yeah, probably the best you can do if you're limiting yourself to a specific store is to stop by now and then and sniff all the flowers.
Each region is going to have different selection, and quite often those plants don't have tags or aren't correctly labelled, so it's hard to say "Yeah, go get this one." because your store may not carry it and even if they do it may not be labelled.
Anyway, some of the Phalaenopsis (one of the most common type of orchid to find in mass market retailers) are fragrant. Lots of the Oncidium group (the next most common and much more variable group) are fragrant. Plus, if you're on the west coast, your Trader Joes might have Cymbidiums, some of which are quite fragrant.
What are your indoor growing conditions like? How much light can you provide & what are your temps and humidity like? That might help guide you to the appropriate plant(s) for your conditions.
Another thing to keep in mind is that these plants won't be as fragrant in the store as they would be at home in good growing conditions and good light. So, a plant might have a very faint scent in the store, you may need to give it a good whiff. Also, many orchids are only fragrant at certain times of day (or night), so make sure you aren't always visiting at the same time of day if you're doing the sniff test. Some things are most fragrant in the morning, others in the afternoon, a few are fragrant all the time, some just at night.
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