Amazon with DOOMIER has the ASOI 2.4GHz Wireless Mouse w/ USB Nano Receiver for $12.99 – $7.14 off with coupon code ATMVKU3X [Exp 11/19] = $5.85 with free shipping on $25+ or with Prime.
Amazon with VicTsingDirect has the VicTsing Wireless Ergonomic Vertical Optical Mouse with 4 Adjustable DPI 1000/1600/2000/2400 Levels (2019 upgraded model) for $16.99 – $8.16 off with code UU8L8YDN at checkout = $8.83 with free shipping on $25+ or with Prime.
Amazon has the VicTsing Wireless Ergonomic Vertical Mouse for a low $8.99 after Coupon Code: “WHWU4HFU” and clippable coupon. This is a pretty good price as it typically sells for closer to $12 on sale.
We own a wired version of this mouse. In our experience, we’ve found it significantly reduces wrist strain when working many hours glued in front of a computer.