You can create price alert here, copy coupons and view price history. Let’s see what best price is ATM.
Product Size: 40.5cmx 7cmx 6.5cm(15.9″x2.7″x2.6″) Bluetooth Version: 4.0 Bluetooth transmission range: 10m Battery Capacity: 1500mAh Play Time: 6 Hours Output Power: 5W*2 Frequency Response: 100Hz-20kHz SNR: ≥75dB Charging Type: Micro USB
Aliexpress
There’re some similar (or not) items on Aliexpress
Click here to search by yourself. Here are coupons that you can use.
Latest price update (UTC time):
Banggood
Banggood warehouse is located in China. CouponsFromChina software could not find any coupon for this product in Banggood.
Link: Banggood product page
Price: $-3
It looks like this item is out of stock in Banggood. If you found it then please send me the link. I will replace it.
Click here to search on Banggood!
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/5cd
Old coupons (from the oldest to the newest): 3623d5, e2bcea, TTxBG10, 2019SPEDM, BG3CSUM, AFfbG10, affbg10, 502C6B, BGBFAFF2019, BGCITYADS2019, BGVDay10%off, EARSP11, BGAFF10OFF, BGTT10, bGhOnEy10
(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
Do you need price history chart (for all/most countries) for AWI ES-978 Soundbar Black? There we go.
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)).