Thumb Score: +22

Woot! [woot.com] has 2-Pack Hyperkin Joy-Track Duo Mouse Grip for Nintendo Switch 2 Joy-Con 2 for $2.99.
Shipping is free for Amazon Prime Members (must login with your Amazon account and select a shipping address in order for Woot to apply free shipping) or is otherwise $6 per order.

Price:
$14.01 lower (82% savings) than the reference price of $17