I know what you mean! For the past month, I have had at least two at once (Link and a rescue to be rehomed) and every time I get three, my stress level seems to skyrocket. So I definitely feel you there. Haha. I just wish more people were interested in these little guys! For me, having a permanent home for them to go to is the biggest stressor. And good for your local Petco! I'm glad to hear it's unusual to have dirty betta cups there. Mine ALWAYS has nasty stuff, and at least one dead one. Like today there were two. :/
Kindness and respect should be shown to all animals, no matter if they are furry, scaly, big, or small. Be a hero to the animals and GO VEGAN!