Walmart offers the Kensington Underdesk Comfort Keyboard Drawer, model no. K60004US, for $29.99. Opt for in-store pickup to dodge the $4.97 shipping fee. That's the lowest price we could find by $5. It features a 26" wide tray, wrist rest, mouse pad, and cable management system.
Price Plunge offers the Kensington SmartBeads Wrist Rest in Blue, model no. K62825US, for $4.99 with free shipping. That's the lowest total price we could find by $3. It purports to alleviate pressure and promote circulation while using a mouse.