There are definitely $100 grinders recommended in this sub (Baratza Encore and Capresso Infinity are both just over $100 and can go on sale)
Beginner filter setup
This is only for filter coffee. If you want to do espresso at some point I'd recommend upgrading the grinder to Precisio/Virtuoso.
Burr grinder $129
Porlex grinder $35
Kettle $99
Aeropress $35
Scales $43
Total $306