Amazon has the Anewkodi Ergonomic Wireless Vertical Mouse (Black) for $25.99 - $16 off with coupon YEXC5B8W = $9.99 with free shipping on $35+. List price: $61. Features switch between DPI levels 800, 1200 and 1600 to adjust mouse responsiveness.
Has good Amazon Reviews.
eBay has the Logitech G602 Wireless USB Gaming Mouse (910-003820) for $40 with free shipping. List price: $80. Features a 250 hour battery life, Delta Zero sensor technology, 2ms report rate and a performance/endurance switch.