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Techblue ocean via Amazon [amazon.com] has Tecknet Pro Silent Wireless Bluetooth Mouse w/ 6-Level DPI & 3-Device Connection (Black) on sale for $16.99 – $10.00 off when you apply promo code K3BG24XK at checkout = $6.99. Shipping is free w/ Prime or on orders $35+.

Note: Amazon promo codes don’t always apply seamlessly. If you run into this issue, try refreshing the page, re-entering the code, or checking after you select a payment method to confirm whether it already applied.