Its honestly the hardest thing to do, (to not continue the inhumane selling of bettas for instance), and I'll be the first to admit to you. I've gone into the store and would ONLY LOOKING for something for my dog and next thing you know, Im right there, where I don't want to be, knowing I shouldn't be. In front of tiny glass bowls where anywhere from 10-50 and sometimes even more! bettas are being held captive in an AIR CONDITIONED environment, and without hesitation ask one of the salespersons, "Please bag this guy, this guy, this guy, and this young lady up for me"....Then they go..."You know...." I say "I already know", with a Don't pi** me off look right now because I already am, and thats the end of it....but its not. They ring them up and I'm out the store wondering, why the heck did I do that? Thankfully the last one I purchased, which ended up getting me back into the hobby was pumpkin and since then I have been supporting US and International breeders, and working on my own lines myself. But I can totally agree, that Its so simple to just be able to walk in the store and get a betta for 3.99, end up finding a forum like this where people actually know what their talking about, and then begin to rant and rave about how bettas are kept at stores. Theres really only one way out and thats to not buy them period.
When we "rescue" a betta from the chain store we might as well ask the salesperson an exact details about when their shipments of live fish arrive so that we can come back to rescue another one at least once a week, because after all, they purchased that betta for maybe 0.75 cents at most, you purchased it for 4.99 plus tax, thus you paid for the 2 or 3 that died right next to it and also paid for the next 2 that will be arriving next week to replace them.