Thermaltake Poseidon Z Mechanical Keyboard for $56 + free shipping
Best Buy offers the Thermaltake Poseidon Z Mechanical Gaming Keyboard in Black, model no. KB-PIZ-KLBLUS-06, for $55.99 with free shipping. That's the lowest total price we could find by $10. It features an LED backlight with four levels of brightness, full N-key rollover, and multimedia keys.
2 very similar deals were also reported by some other sources: