What's your current motherboard?
Assuming you have a 7th-gen Intel platform (B250 mobo), only option for that price is either the Pentium G4560 or the slightly faster G4600. Currently, the G4560 (3.5GHz 2C/4T) costs $96 while the G4600 (3.6GHz 2C/4T) costs less at $87:
PCPartPicker part list /
Price breakdown by merchant
CPU: Intel - Pentium G4600 3.6GHz Dual-Core Processor ($86.88 @ OutletPC)
Total: $86.88
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2017-09-30 21:38 EDT-0400
[video="https://www.youtube.com/watch?v=DL7YcPlJ83c"][/video]
More info here: https://www.gamersnexus.net/guides/2913-when-does-the-intel-pentium-g4560-bottleneck-gpu