Amazon has SteelSeries Rival 3 RGB Wired Optical Gaming Mouse w/ 6 Programmable Buttons on sale for $13.98. Shipping is free w/ Prime or on orders $25+.
GameStop also has SteelSeries Rival 3 RGB Wired Optical Gaming Mouse w/ 6 Programmable Buttons on sale for $13.98. Select free store pickup where available, otherwise shipping is free on orders $59+.