Aliexpress
Click here… to search for 2000W Miner Graphics Card Power Supply 80+ Platinum 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 (70.47 USD): BG8FORMULAMX
(CouponsFromChina.com tip: coupon code has to be applied in shop’s 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): BGyuityui, BG345dfgs, BGpowerr1, BGgsdge5, 7bcdf9, BG7f4f63, BG1fe2d6, BG215f2a, BGee119f, BG00c906, 2022ACTIESNL, BG3454bd, MVC8SPRING, 8BGwbg2204, hoNEYbGdeAlS, Cuponation9, BGCPNES12, BG589b2e, BGSaleFeb8, BGSaleAD, BGMARCHSALE, BGAUGUST8, BGCAPITALOS8, BGCOUPERT8
(these coupons are old, so probably won’t work)
Price history and price alert
Price history (for all/most countries) for 2000W Miner Graphics Card Power Supply 80+ Platinum is here.
Price records source(s): Banggood
Click on image to enlarge. 
You can set price alert (for Banggood).