Aliexpress
Click here… to search for Sanrenmu 7045 LUI-PH-T4 Knife on Aliexpress
Here are coupons that you can use.
Latest coupon and price update (UTC):
Banggood
Banggood warehouse is located in China.
Link: Banggood product page
Coupon (13.38 USD): BGherra
Coupon (13.38 USD): BgcLuBofErtA10
(CouponsFromChina.com tip: you should apply the coupon in your cart 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): 502C6B, BG2020NS, bGhOnEy10
(probably won’t work, but you can try them out)
Price history and price alert
Check out price history chart (for all/most countries) for Sanrenmu 7045 LUI-PH-T4 Knife.
Price records source(s): Gearbest, Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).