Aliexpress
Click here… to search for DIGOO DG-TA01 Bolt Door Window Alarm on Aliexpress
Here are coupons that you can use.
Latest price update (UTC time):
Banggood
Banggood warehouse is located in China. There is one coupon available! Pretty cool, huh?
Link: Banggood product page
Coupon (4.49 USD): BgcLuBofErtA10
(CouponsFromChina.com tip: paste coupon code in your cart and click Apply 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): 5TA01, affiliate6, aff7off, bgssaff9, BGDigoo15%, bgdigoo15%, BGaDmITAd, bgchinafest, BGBFAFF2019, BGBFCR01, BGCITYADS2019, BG9NY, 2020CNY, BGVDay10%off, BGDG15, BGSAMH
(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 DIGOO DG-TA01 Bolt Door Window Alarm? There we go.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).