You are gonna have to look for a used z170 motherboard to get on for under $60. You could get a h110 motherboard for under $60. You know that the Pentium is a locked CPU and a z170 motherboard wont be able to overclock it? So you will be paying for features that you cant use.
Here is the cheapest z170 mobo I could find.
PCPartPicker part list:
https://pcpartpicker.com/list/qwP2Jx
Price breakdown by merchant: https://pcpartpicker.com/list/qwP2Jx/by_merchant/
Motherboard: Supermicro - C7Z170-SQ ATX LGA1151 Motherboard ($79.99 @ Newegg Business)
Total: $79.99
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2018-04-17 15:58 EDT-0400