Aliexpress
Here are coupons that you can use.
Latest coupon and price update (UTC):
Banggood
Banggood warehouse is located in China. Well, there is one coupon available right now.
Link: Banggood product page
Coupon (70.68 USD): BG1b5830
(CouponsFromChina.com tip: 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
Old coupons (from the oldest to the newest): BGCNSYAGV, BGHOMEA13, BGCNSYGTR, BGCZSASH39, BGCNSYPWA39, 7d18f7, BGCZSUYAP39, BGLOAC1, BGCNGFDESY, BGHAQQU, BGCZFDRELU, BGCZCNYU, BGCNCZFSY39, 13f142, BGCNZSDE39, BGCNSYU39, BGCNCZDS39, BGHU0629, BGCNCZSY39, BGCZSY39, BGCZRESH9, BGCZFDSR39, BGCNSYU3, BGCZUSY39, BGCNCZDE3, BGCZSYT39, BGc861e2, BGc3f471, BGd173b4, BGAlerabatKL, BGAudioVideo, BGAUDIO
(you can check these old coupons out, but these probably won’t work)
Price history and price alert
Check out price history chart (for all/most countries) for SOAIY SH39 Bluetooth 5.0 Speaker.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).