Just check coupons out (with price alert and history). Let’s see what best price is ATM.
Frequency response: 20Hz – 20KHz, Bluetooth version: 4.1, Bluetooth distance: 8 – 10m, Output power: 5Wx 4
Aliexpress
I could not find it on Aliexpress. Click here to search by yourself.
Here are coupons that you can use.
Latest coupon and price update (UTC):
Banggood
Banggood warehouse is located in China.
Link: Banggood product page
1. ($42.67): BGHONEY2110
2. ($46.41): 13f142
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): 502C6B, elec, AFfbG10, BGBFAFF2019, BGCITYADS2019, BGE13, BGVDay10%off, BGAFF10OFF, BGTT10, bGhOnEy10, 6f889a, BGdragonBoat, BGSS10%SW, BgoFErTaSchInA10, BGELIG0920, BgcLuBofErtA10, BGCuponation10
(I don’t think these’re gonna work, but you can try ’em out anyway)
Price history and price alert
Check out price history chart (for all/most countries) for Shunpad BS-28 Portable Bluetooth Soundbar.
Price records source(s): Gearbest, 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)).