Aliexpress
Here are coupons that you can use.
Latest coupon code price check (UTC time):
Banggood
Banggood warehouse is located in China.
Link: Banggood product page
Coupon (16.00 USD): MVC8SPRING
Coupon (16.17 USD): 2203ActiesNL
Coupon (16.35 USD): BG00c906
(CouponsFromChina.com tip: you should apply the coupon 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): 502C6B, FBCOUPON1, bGhOnEy10, BGU791, BGAFF10OFF, BGCuponation10, BGa72e7d, 13f142, BGHONEY2110, 00c906, BGe46870, 2022ACTIESNL, Terence, Tabby20, BG1efeb0
(these coupons are old, so probably won’t work)
Price history and price alert
Here is price history (for all/most countries) for BAOFENG K35 2W Radio Walkie Talkie.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).