Velocifire via Amazon offers its Velocifire Wireless Erogonomic Vertical Mouse for $19.99. Coupon code "DPBPWVLC" cuts that to $9.99. Plus, Prime members bag free shipping. That's $4 less than our September mention, $20 off list, and the lowest price we could find for this optical obelisk. It features adjustable DPI sensitivity and six buttons. Deal ends December 31.