Need Samsung Phone Recommendation

[Android Central Question]

My wife's old Avant is falling apart at the seams.
I would like to get another Samsung, preferably a Galaxy (I use an S5 at work and my son has an S8).
Can anyone recommend a new or used Samsung that costs under $100 new or used, would work on T-Mobile, and have performance at least comparable to the S5, if not better?

Thanks.