I believe 90% of the LFS here sell their bettas in the same way, basically one in a puny tank. If you are worrying about the conditions, buy from home breeders. Check the Marketplace, but chances are, these fish would be subject to the same treatment as well.
If I want a Betta I usually visit C328, but it's a hit and miss kind of thing when you buy from LFS. As long as the fish isn't emaciated or show signs of fin damage, genetic deformity, they should be fine if you put them through quarantine first.
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