When I was updating this page, then coupon price was 39.99 USD for Mijia 2000mAh (in Banggood). You can create price alert here, copy coupons and view price history. What is best price?
Latest coupon and price update (UTC):
Banggood (39.99 USD)
Banggood warehouse is located in China. There are no active coupons for this product, but the price is pretty low isn’t it? But wait a sec… Is it a good price? Well, this price is higher than average price (38.12 USD)
Link: Banggood product page
Price: 39.99 USD
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k
Old coupons (from the oldest to the newest): BG589b2e, BG8FORMULAMX
(these coupons are old, so probably won’t work)
Aliexpress
Click here… to search for Mijia 2000mAh Rechargeable Desk Lamp on Aliexpress
Here are coupons that you can use.
Price history and price alert
Here is price history (for all/most countries) for Mijia 2000mAh Rechargeable Desk Lamp.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).