Aliexpress
Click here… to search for BlitzWolf BW-LT19 Diamond Night Lamp on Aliexpress
Here are coupons that you can use.
Latest price update (UTC time):
Banggood
Banggood warehouse is located in China.
Link: Banggood product page
Coupon (17.99 USD): BGHome15%
Coupon (18.89 USD): BGAFF10OFF
Coupon (18.89 USD): bGhOnEy10
Coupon (18.89 USD): BGHOMEA15%
(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): BGss10%bw, AFfbG10, BGLT19304, BGBWLT19, BGLT1911, BGDKS11, BGBWLT19Light, BGBWLT199, BGBWLT899, BGTY2K, BGVDay10%off, BGHOMEG12, BG85433T, BGBW152, BGdragonBoat, BGSS10%SW, bgshOOp10, BGSMARTBUYT19
(probably won’t work, but you can try them out)
Price history and price alert
Here is price history (for all/most countries) for BlitzWolf BW-LT19 Diamond Night Lamp.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).