TechRise Direct via Amazon [amazon.com] has TECKNET 8000DPI RGB Wired Gaming Mouse with 6 Programmable Buttons on sale for $19.99 - $6 off when you clip the coupon on the product page - $3 off when you apply promo code WUNPNFF3 at checkout = $10.99. Shipping is free w/ Prime or on orders $35+.

Note: Amazon promo codes don't always apply seamlessly. If you run into this issue, refresh the page, re-enter the code, or revisit the cart page.