Just check coupons out (with price alert and history). What is the best price?
Communication distance 1-15km, Operating Voltage 3.7V, Output power 20W, Plug US Plug, Frequency Range 400-470MHz, Brand MOTOERA, Channels 16
Aliexpress
I could not find it on Aliexpress. Click here to search by yourself.
Here are coupons that you can use.
Latest price update (UTC time):
Banggood
Banggood warehouse is located in China. There is one coupon right now! Check this out.
Link: Banggood product page
1. ($25.46): BG589b2e
put item in your cart and apply coupon code there after clicking “Proceed to checkout”. Click to copy code and open shop.
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/5cd
Old coupons (from the oldest to the newest): BGCuponation10, 13f142, BGHONEY2110, BGd0b05d, 00c906, BG00c906, BGe46870, 2022ACTIESNL, Terence, Tabby20, 2203ActiesNL, BG1efeb0, MVC8SPRING, 8BGwbg2204, tRaDetRaCKeR, 8wEbgaInS5, pROMo8cuPoN, hoNEYbGdeAlS, BGJUNEGSG9, BG8ReviTrage, Cuponation9, BGcoupon8off, BGGutscheine, BG8OFFCOUPON, TTBLACK5
(probably won’t work, but you can try them out)
Price history and price alert
Price history (for all/most countries) for MOTOERA GP-3988 20W Radio Walkie Talkie 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)).