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.
Basically copy coupon, view price history or create e-mail price alert. What is the best price?
Aliexpress
There’re some similar (or not) items on Aliexpress
You can use link bot to get even lower price:
Click here to search by yourself. Here are coupons that you can use.
Latest coupon code price check (UTC time):
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.
Additional Banggood coupons: first page and second page
Old coupons (from the oldest to the newest): 502C6B, AFfbG10, BGVDay10%off, BGAFF10OFF, BGTT10, bGhOnEy10, BGdragonBoat, BGSS10%SW, bgshOOp10, BgoFErTaSchInA10, BGELIG0920, BgcLuBofErtA10, BGCuponation10
(these coupons are old, so probably won’t work)
Price history and price alert
Price history (for all/most countries) for Baofeng UV-B6 Radio Walkie Talkie is here. The lowest price was: $33.8.
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)).