I have just checked coupons. The lowest price I could get is $19.99 for 10inch Backlit For iPad Keyboard and Mouse Set (in Banggood). Just check coupons out (with price alert and history). Let’s see what best price is ATM.
10inch Backlit For iPad Keyboard and Mouse Set Backlight Bluetooth Keyboard For IOS Android Windows Wireless Keyboard and Mouse – English
Latest coupon and price update (UTC):
Banggood ($19.99)
Banggood warehouse is located in China. So I have checked for active coupons (all category coupons and old ones), but there was no working coupon in Banggood. Is it a low price? Maybe there’re no more promotions for this item, because current price is higher than average (which is equal $16.99)
Link: Banggood product page
Price: $19.99
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/5cd
Aliexpress
There’re some similar (or not) items on Aliexpress
Click here to search by yourself. Here are coupons that you can use.
Price history and price alert
Price history (for all/most countries) for 10inch Backlit For iPad Keyboard and Mouse Set is here.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood and Aliexpress (only if product name will be the same as on Banggood and I will post it on social media though, so it’s more like Banggood price alert)).