Diiib Super Ion Sterilization Smart Toilet Lid DXMTG011 (Banggood, Aliexpress: Rated Voltage 220V, Product Net Weight 3.9kg, Product Model DXMTG011, Power Cord Length 1.2m, Rated Power 1150W, Waterproof Rating IPX4, Product size 511*452*129mm, Water Supply Pressure 0.1Mpa-0.75Mpa (static pressure), Brand Diiib, Rated Frequency 50Hz (the best price with coupon)).
Basically copy coupon, view price history or create e-mail price alert. What is the best price?
Aliexpress
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Click here to search by yourself. Here are coupons that you can use.
Latest coupon and price update (UTC):
Banggood
Banggood warehouse is located in China. You can get coupon down below.
Link: Banggood product page
1. ($306.43): BG00c906
apply it 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/feV
Old coupons (from the oldest to the newest): BGXPDE084, 00c906
(system checks these coupons on every price check (like once per 24 hours), but you can check them out anyway)
Price history and price alert
Price history (for all/most countries) for Diiib Super Ion Sterilization Smart Toilet Lid DXMTG011 is here. The lowest price was: $306.43.
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)).