As one of its daily deals, Amazon offers the Razer Naga Chroma Ergonomic MMO Gaming Mouse, model no. RZ01-01610100-R3U1, for $39.99 with free shipping. That's tied with our November mention and the lowest total price we could find by $20. It features 16,000 DPI, backlighting, and a 12-button mechanical thumb grid. Deal ends today.