For $100 you'll have to look around and take the best you can find for that money. I was looking for an "open mic bass"; one that I could put on stage for all comers and not worry about it. I snagged a mint (yes, really mint) Squier Jaguar long scale for $85. I set it up, dressed some frets, and it's a beauty. Plays and sounds so good I'd use it for any of my gigs (but prefer my Jazz and Precision basses).
I've never shopped for basses at this level of the spectrum, so can't recommend any brands or models.
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