https://computers.woot.com/offers/logitech-ergo-m575s-wireless-trackball-mouse Logitech Ergonomic M575S Wireless Trackball Mouse for $39.99 - $5 w/ code ERGOFIVE at checkout = $34.99. 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 $6 per order.