Aliexpress
Here are coupons that you can use.
Latest coupon and price update (UTC):
Banggood
Banggood warehouse is located in China. There is one coupon available! Pretty cool, huh?
Link: Banggood product page
Coupon (44.68 USD): BG2589f4
(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, Baofeng, elec, fd2bd0, AFfbG10, BGBFAFF2019, BGCITYADS2019, BGE13, BGVDay10%off, BGAFF10OFF, bGhOnEy10, BGdragonBoat, bgshOOp10, BgoFErTaSchInA10, BGELIG0920, BGTT10, BgcLuBofErtA10, BGCuponation10, 13f142, BGHONEY2110, BGd0b05d
(system checks these coupons on every price check (like once per 24 hours), but you can check them out anyway)
Price history and price alert
Price history (for all/most countries) for BAOFENG BF-F8-Plus Walkie Talkie is here.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).