While traveling around to buy supplies for my first betta (eeee!!) we went to a few different stores..
The first store was the one I described earlier that had great care techniques and gave good advice on caring for bettas
The second was walmart!
Guess which had the most dead fish? The local fish store. They got a bad batch, in fact their shipment came in the day before we went to the store..and already there were 8 dead bettas! In just one day! The water was crystal clear, it was obvious something had happened. Maybe in the shipping process. The fish left over from their last shipment were healthy, and their sorority was EXCELLENT(they used a betta sorority in their tank where they sell some of the freshwater plants. SO fun to see in action, and none of them even seemed to have any nipped tails or anything!
Walmart the water was nasty. I mean a gross gross brown, and those fish..they were way more active! Clearly fighters, but it was such a shame, they were all put out of the way, I didn't even notice them at first---Picture one of the shelf walls--they were on the bottom two shelves in the shadows underneath all the other fish supplies. One of the employees didn't even know they sold bettas! Not a single dead one though, it was just dumb! They were also a very high quality, it was clear they were probably culls from a breeder, I saw some piebalds and even a salamander(but he didn't have the best looking tail)
It was just sad and confusing. You see a store working hard to keep their fish alive and healthy, and another store with no regard for their fish..and they get the healthy ones??

Yuck! That's the way life goes I guess. The poor girl at the aquarium store was so heartbroken when I told her I had found some dead bettas, she told me she had more in the back in worse condition and tried to only put out the healthiest fish.. Eugh! What a shame.