Oittm via Amazon offers the Oittm Charge Dock for Apple Watch in Silver, Space Grey, or Rose Gold for $27.99 $25.99. Coupon code "A4XEF4OA" cuts it to $19.87. Plus, Prime members qualify for free shipping. (Non-members can spend $35 to qualify for free shipping; otherwise, shipping adds $6.63.) That's the lowest total price we could find by $16. It features four USB ports.

Update: The post-coupon price has dropped further now, to $18.45.