Emarth Tech via Amazon offers its Emarth GS4 Mechanical 87-Key Gaming Keyboard for $31.99. Coupon code "46AH77R5" cuts the price to $22.71. Plus, Prime members receive free shipping. That's $2 under our mention from last month, $9 off list, and the lowest price we've seen. It features 10 levels of brightness, 12 multimedia controls, and Windows key lock-out option.