Refurbished Logitech G602 Lag-Free Wireless Gaming Mouse with 11 Programmable Buttons for $30 @ eBay
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eBay with TechRabbit has the manufacturer refurbished Logitech G602 Wireless Gaming Mouse (910-003820) for $ 37 – 20% off with code P20FINDYOURTECH [Exp 5/18; requires Paypal] = $ 30 with free shipping.