Aliexpress
There’re some similar items on Aliexpress in my database. There may be some other items though.
| Image | Product (link) | Price | Coupons |
|---|---|---|---|
 |
Wireless Keyboard 2.4G RF With Touchpad for TV Box | 15.17 USD | – |
Here are coupons that you can use.
Latest price update (UTC time):
Banggood
Banggood warehouse is located in China.
Link: Banggood product page
Coupon (18.79 USD): BG589b2e
Coupon (18.79 USD): BGProjcc
(CouponsFromChina.com tip: this code has to be applied in your cart after clicking “Proceed to checkout”. Click to copy code and open shop)
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k
Old coupons (from the oldest to the newest): BGProj
(these coupons are old, so probably won’t work)
Price history and price alert
Price history (for all/most countries) for TV 2.4G Wireless WiFi Mirroring Cable Adapter Dongle is here.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).