Logitech G602 wireless 11-button mouse for $30.
I believe the lowest it’s ever been was $25 last BF/CM cycle.
https://www.amazon.com/dp/B00E4MQODC
Uses its own 2.4GHz Dongle (not the Unifying one) and comes with 2 AA batteries.
Looks like they are price-matching the from a few days ago.