Office Depot and OfficeMax offers the Microsoft Natural Ergonomic Keyboard 4000, model no. B2M-00012, for $30.99. Apply coupon code "14481069" to cut the price to $20.99. Opt for in-store pickup to avoid the $9.95 shipping charge. That's the lowest price we could find by $9, although we saw it $3 less last fall. This USB keyboard features a split-key layout, programmable multimedia keys, and integrated palm rest. Deal ends March 7.