Aliexpress
Click here… to search for Tronsmart Splash 1 Bluetooth Speaker on Aliexpress
Here are coupons that you can use.
Latest price update (UTC time):
Banggood
Banggood warehouse is located in China. Well, there is one coupon available right now.
Link: Banggood product page
Coupon (25.88 USD): BG1b5830
(CouponsFromChina.com tip: coupon code has to be applied in shop’s 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): BGBuscape01, BG651551, BGBRPL2, BGHOTSHOP15, BG53e9c8, BGAlerabatKL, BGd173b4, BGAudioVideo, BGAUDIO, BG9ba0e8
(these codes were not working in latest coupon update, but you can check them out anyway)
Price history and price alert
Price history (for all/most countries) for Tronsmart Splash 1 Bluetooth Speaker is here.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).