Logitech MX Ergo Plus Advanced Wireless Trackball Mouse for Windows PC and Mac (910-005178) $65

The ergonomic trackball is on discount today (matching Amazon, and BestBuy), and stacks with the $15 off coupon (17248).
https://www.staples.com/Logitech-MX-Ergo-Trackball-Mouse-910-005177/product_2764655?cid=EM:ordconfrm::sku&data-cta-category=[PRODUCT]&akamai-feo=off
https://www.staples.com/Logitech-MX-Ergo-Trackball-Mouse-910-005177/product_2764655?cid=EM:ordconfrm::sku&data-cta-category=[PRODUCT]&akamai-feo=off