Basically copy coupon, view price history or create e-mail price alert. You probably want to know what is the best price?
Aliexpress
There’re some similar (or not) items on Aliexpress
Click here to search by yourself. Here are coupons that you can use.
Latest coupon code price check (UTC time):
Frequency Range UHF: 400-470MHz +, Color Black, Working temperature -20 ~ +60°C, Max output power 5W, Inductively loaded antenna Yes, Memory Channels 99 groups, Dual frequency or Single frequency Dual frequency, FM radio Yes(65-108MHz), Battery capacity 2000mAh, Battery type Li-ion battery, Rated Voltage DC 7.4V ±10%, Weight 210g(Included Antenna), Antenna Impedance 50 ohm, Dimension 38x 58x 120mm(not antenna), VHF: 136-174MHz, Dual band or Single band Dual band
Banggood
Banggood warehouse is located in China. I found coupon for you. Check this out.
Link: Banggood product page
1. ($44.13): 13f142
coupon code has to be applied in shop’s cart 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): 502C6B, AFfbG10, BGVDay10%off, BGAFF10OFF, BGTT10, bGhOnEy10, BGdragonBoat, BGSS10%SW, bgshOOp10, BgoFErTaSchInA10, BGELIG0920, BgcLuBofErtA10, BGCuponation10
(sometimes old coupons work, so you can check them out (this site checks them on every price update))
Price history and price alert
Check out price history chart (for all/most countries) for Baofeng UV-B6 Radio Walkie Talkie.
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)).