Just check coupons out (with price alert and history). What is the best price?
Frequency response: 20Hz-16kHz, Battery capacity: 3.7V/20000 mAh, Product size: 300*100*134mm, Brand: XDOBO, Using Time: ≥12 hours, Output Power: 100W RMS, Charging time: 8 hours, bluetooth version: V5.0, Wireless transmission range: ≥18m (open area), Model: X8 Max, Audio noise ratio: ≥75db
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. I found coupon for you. Check this out.
Link: Banggood product page
1. ($175.94): BGAUDIO
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): BGAlerabatKL, BGVNXDBX8, BGVNXDBX88, BGAudioVideo
(I don’t think these’re gonna work, but you can try ’em out anyway)
Price history and price alert
Do you need price history chart (for all/most countries) for XDOBO X8 Max 100W Bluetooth Speaker? 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)).