Good luck. There really isn't much for under $100 today. The first real cue that I bought was in 1985. It was a Schon R5. Paid the ungodly price of $125. Everyone said that I got screwed. They never heard of that cue and I should have bought a McD or Meiucci.
I have bought a lot of high end cues since and that Schon is still one of my favorites.
Don't be afraid to spend a little more. Consider it to be a investment.