Well, even in California, you can buy pure acetone OTC – you just have to interact with a human cashier who probably won't even know why the self-checkout refuses to let you buy it. I don't care one way or another except that the big box stores try to push you towards the self-checkout lanes.

Nail polish remover, like non-ethyl alcohol, is likely to be adulterated (e.g. with scents or crap to soften your cuticles, etc.). Depending on how clean you need something to be it may be an issue (and you probably can find high test nail polish remover). I was removing these infernal stickers from cooking implements so I went with the big box store. Depending on what you're working with you may still need to wipe it down with isopropyl anyhow.