Aliexpress
Click here… to search for DIGOO DG-663 Touch Sense Desk Lamp on Aliexpress
Here are coupons that you can use.
Latest coupon and price update (UTC):
Banggood
Banggood warehouse is located in China. I am tired of searching coupons, but I found one for you…
Link: Banggood product page
Coupon (11.99 USD): BGTYOT802
(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): 20%DG422, BGDG663T, BGDigoo15%, BGDGASG, BGHome15%, BGHOMEA15%, BGHBHJ105, BGJATD802, BGJAFO802, BGFEFR802, BGDEAL802, BGFEFO802, BGAFF10OFF, BGCuponation10, 13f142, BGHONEY2110, BG10OFFAFF, BGAPSX802, BGwhielabel, BGJUZX802, BGis802, BGlyis802, BGPDhome69, BGZXJU802, BGLYTD802, BGISLT802, BGFOLY802, BGLIG12, BGTYOC802, BGISOC802, BG10OFFAFF1, BGd0b05d
(sometimes old coupons work, so you can check them out (this site checks them on every price update))
Price history and price alert
Price history (for all/most countries) for DIGOO DG-663 Touch Sense Desk Lamp is here.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).