I have a somewhat hard of hearing friend who is looking for a replacement headset for his iPhone.  He's mostly looking to get better fidelity for speaking in the ear buds and microphone and will spend up to $100.  He would like an ear bud solution and is not interested in IEMs.

Any recommendations you can give will be greatly appreciated.

i don't know that he'd do better than the regular apple earbuds at that price range, if he's specifically excluding IEMs.  Otherwise the KZs that brent recommended are pretty good, and $20.

https://www.amazon.com/dp/B00N3RFFZ2/ref=twister_B0144QGJFA?_encoding=UTF8&psc=1