Logitech has the Logitech M310 Wireless Mouse (Dark Aces) for $15. Add two to cart to reach $30 - $8 off with coupon code logi_m310_11212 [Exp 11/5] = $22 with free shipping. $20 minimum required for free shipping; $6 shipping for orders under $20. Boasts about a year of battery life.
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