

Found an aggregate site with a comprehensive list by state. The ones I tapped into are metro and have no online order options which makes them inaccessible to many.
To be fair, oil paint keeps for a really long time, I’ve used decades old inherited items, so I can’t imagine a lot of it gets donated. And I wouldn’t trust used acrylics for the opposite reason, as it tends to solidify in the tube over time.
It’s a neat idea, but access online is something most people rely on, so, after Blick, what is there, online?

I agree with legalizing assisted suicide for terminally ill humans. As such, if the pets quality of life at the end of life declines that much, then yes. Sometimes the treatments make things worse.
For example, on the human side, people may not want to spend most of their last days in hospitals hearing machines beep and sleeping in an uncomfortable hospital bed. They want to go home, be comfortable, and die not in pain. Fair. In states where it’s legal, that sometimes means taking prescribed euthanasia on their terms, rather than letting the cancer do it. Sometimes it means just having the option close by as a reassurance while letting the cancer take them, but I digress.
How much do our pets like the vet? Staying overnight? Considering that at the end, alongside pain, is something we have to weigh in these decisions. Unfortunately, unlike humans, our pets can’t make that decision for themselves. You’ll have to decide for them. When is enough enough? What’s the balance between their pain and your want to have them with you? None of us can tell you that answer.
The only real advice I can give you is to listen to them, really listen to them, and don’t allow your personal pain drown out their voice. Humans or animals.