It all depends on the store where you live. The Wall Marts near me are typically filthy and it's hard to find a fish behind the huge pile of dead ones in the tank. However, they stock pretty good plants, which I've bought from them on several occasions.
A lot of people don't like PetsMart, but the ones in my area are pretty much the best place to buy freshwater fish. I typically buy my bettas from them, as they tend to have a great selection.
I would agree that it's possible the bettas you are looking at are female and that is why they are smaller. If your Wall Mart is good, I would not hesitate to buy them. If you do not see a healthy fish department when you go there, I would find them somewhere else.
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