Just check coupons out (with price alert and history). Let’s see what best price is ATM.
Module Type: Full module output, Type: 3450W Power Supply（European regulations）, Material: Metal, Input voltage: 180-240v, Size: 295 * 185 * 85mm, Power Out: 3450W, PFC Type: Active, Weight: Approx. 6kg, Interface: 20+4pin /8 IDE /7 SATA /24*6+2pin, Color: Black, Plus: Platinum Label
Aliexpress
There’re some similar (or not) items on Aliexpress
Click here to search by yourself. Here are coupons that you can use.
Latest price update (UTC time):
Banggood
Banggood warehouse is located in Hong Kong. There are no active coupons for this product, but the price is pretty low isn’t it?
Link: Banggood product page
Price: $-3
It looks like this item is out of stock in Banggood. If you found it then please send me the link. I will replace it.
Click here to search on Banggood!
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/5cd
Old coupons (from the oldest to the newest): BGpower02, BGHONEY2110, BGdfasdg3, BG924f20, BGf23d91, BG0bab73, BG840e8c, BG565795, 00c906, BG993c11, BG00c906, ADMITAD2212, 2022ACTIESNL, BGa334d8, BGaa05f8, Tabby20, BG6eac8b, 2203ActiesNL, BG56233e, hoNEYbGdeAlS, BGa73fed, Cuponation9, BGCPNES12, BGbc235f, BGacdfe9, BG589b2e, BGCAPITALOS8, BGBFDAY8, BGSPRING8OFF, BGHONEYSP
(probably won’t work, but you can try them out)
Other warehouses/versions
This item is available in 1 another warehouse/version!
1. Europe – 3450W Miner Power Supply 140mm ATX 12V [EU] ($-3)
Price history and price alert
Price history (for all/most countries) for 3450W Miner Power Supply 140mm ATX 12V is here.
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)).