Pattern Solid Color, Feature Frosted, Brand NILLKIN, Material PC, Type Back Cover, Compatible Model Mi 9 SE.
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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 coupon and price update (UTC):
Banggood
Banggood warehouse is located in China.
Link: Banggood product page
1. ($11.76): 2022ACTIESNL
2. ($11.88): BG00c906
apply code in your basket (cart) 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): BG3CSUM, AFfbG10, 502C6B, BGBFAFF2019, BGBFCR37, BGCITYADS2019, BGVDay10%off, BGAFF7OFF, BGAFF10OFF, bGhOnEy10, BgcLuBofErtA10, BGCuponation10, 13f142, BGHONEY2110, BG20offcspro, BGAlerabat
(these coupons are old, so probably won’t work)
Price history and price alert
Here is price history (for all/most countries) for NILLKIN Frosted Xiaomi Mi9 SE Case. The lowest price was: $6.79.
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)).