Price history, coupons and price alert are available on this page. Best price?
Power Output: 31W, Battery Capacity: 4800mAh, Working Time: 3 hours
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 and price update (UTC):
Banggood
Banggood warehouse is located in China.
Link: Banggood product page
1. ($54.33): BGAFF10OFF
2. ($54.33): BGTT10
3. ($54.33): bGhOnEy10
4. ($55.37): 7d18f7
just apply this code in your cart after clicking “Proceed to checkout”. Click to copy code and open shop.
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/5cd
Old coupons (from the oldest to the newest): BGHO15, AFfbG10, BGHOPE15, BGVDay10%off
(sometimes old coupons work, so you can check them out (this site checks them on every price update))
Other warehouses/versions
This item is available in 1 another warehouse/version!
1. China – HOPESTAR H20 Bluetooth Speaker Red ($-3)
Price history and price alert
Check out price history chart (for all/most countries) for HOPESTAR H20 Bluetooth Speaker.
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)).