Though I haven't actually found good bluetooth headphones for sub $100. My favorite so far were the Senheiser PXC550 (I think thats it). But mine have gotten chewed by a dog :(. I liked the audio quality, didn't love the touch controls, but the cheap headphones I've gotten to replace them just sound awful.
I am impressed with this pair of Silensys PRO Bluetooth headphones. I got them on sale at Amazon for around ~54.00 USD and they're surprisingly adequate. I don't have the money to justify a better pair. They're even noise cancelling too.
Galaxy buds 2 with a good pair of comply foam earbuds tips clocks in at exactly $100 and has a remarkably solid sound for Bluetooth earbuds. If you want audio quality though you're not going to get it in Bluetooth headphones, there you mostly pay for convenience, but I got some galaxy buds 2 recently and they were fine stock but the foam tips sincerely make a huge difference.
Not headphones but the Samsung earbuds are pretty good and I picked them up for ~60$ on Amazon. I hadn't used earbuds for years and had no idea how good the tech has gotten. Super comfortable, pretty good noise muffling, fancy wireless charging. Makes doing yard work go so fast.
Do you have small ears? That's a serious question by the way. I ask because I have really small ears, so a lot of earbuds are way too large and hurt to wear, but ever since I found ones that have small enough soft tips, it's been a totally different experience
I think I have smallish ear canals which may be the culprit because man do ear buds cause discomfort. I like headphones that completely cover my both my ears. I can wear them all day long without issue.
I definitely prefer the big over-ear ones myself, but I've found that earbuds are just so much more convienient to have with me, and they're also much better at forming a seal for noise cancelation.