Lens color Light yellow, Material PC lens / silica gel nose pad / TPE lens leg / PEI frame, Wearing experience Light / Comfortable, Name Xiaomi TS Anti-blue glases FU006, Visual perception Strong texture / Exquisite, Frame size 54-17-138mm, Frame color Red, Function Blue Light blocking of 35% / Anti fatigue.
Basically copy coupon, view price history or create e-mail price alert. Best price?
Aliexpress
There’re some similar (or not) items on Aliexpress
You can use link bot to get even lower price:
Click here to search by yourself. Here are coupons that you can use.
Latest price update (UTC time):
Banggood
Banggood warehouse is located in China.
Link: Banggood product page
1. ($24.53): BG4ee866
2. ($27.13): BG00c906
put item in your cart and apply coupon code there after clicking “Proceed to checkout”. Click to copy code and open shop.
Additional Banggood coupons: first page and second page
Old coupons (from the oldest to the newest): BG57637, BGUN5737, BGHONEY2110, BG10OFFAFF, BGMAY056, BGESMAY01, BGH57637, BGesjune19, BGjune100, BGwhielabel, 13f142, BG10OFFAFF1, BANGGOODSD, BGHealth06, 00c906, BGHealth10D, 2022ACTIESNL, BGHB218, BGGRFE216, BGXPMA096, BGHECARE1, BG52f9b9
(there’s a little possibility that old coupon will work)
Price history and price alert
Here is price history (for all/most countries) for Xiaomi Mijia Anti-Blue Glasses. The lowest price was: $9.99.
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)).