I just got a job doing 3rd shift grocery stocking, usually they don't allow earbuds but there's no customers so everyone does it anyway.
I'd like to get something ~$30 or less (I don't really care about the sound quality so much as long as it doesn't sound terrible), and battery life lasting at least 8 hours. Wireless because I don't want the wire getting in the way of anything or feeling weird down my shirt.
I have these ones and liked them well enough that I gifted a pair each to my husband and my brother, who also like them just fine. They're on sale right now for $23. They last around 9-10 hours per charge, and they only take a little while to charge up to full in the case - maybe 15-20ish minutes? I use them 12+ hours every day, usually wear one at a time so I can hear what's going on around me and swap out if I run it down, and only charge the case every few weeks.