Logitech G400 Optical 3600 dpi Gaming Mouse $32.99 shipped at Newegg
Newegg has the Logitech G400 Optical 3600 dpi Gaming Mouse for $42.99 - $10 off promo code EMCNBJF83 (Exp. 8/20) = $32.99 with free shipping. In-game sensitivity switching: Four dpi levels let you instantly go from pixel-precise targeting to lightning-fast maneuvers. NEWEGG
Next lowest price on Google Products is $38.95.