Size 241*125*65mm, Input voltage 90-132VAC/180-264VAC, Adjustable ±10%, Voltage 70V, Model S-800-70V (Custom Edition), Power 800W.
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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 code price check (UTC time):
Banggood
Banggood warehouse is located in China.
Link: Banggood product page
1. ($76.50): hoNEYbGdeAlS
2. ($78.16): BG00c906
just apply this code in your cart after clicking “Proceed to checkout”. Click to copy code and open shop.
Exclusive Allowance Coupons: https://bit.ly/3xWgD9k and https://couponsfromchina.com/short/i1u
Old coupons (from the oldest to the newest): bGhOnEy10, BG70V, BGS70V, BgcLuBofErtA10, BG53PSU, BGCLUBOFERTA10, BGAFF10OFF, BGCuponation10, BG59PSU, BGHONEY2110, 13f142, BG4742c4, ADMITAD2212, Terence, Tabby20, tRaDetRaCKeR, 8wEbgaInS5, pROMo8cuPoN
(there’s a little possibility that old coupon will work)
Price history and price alert
Do you need price history chart (for all/most countries) for RD6012 RD6012W S-800-70V 11.4A Switching Power Supply? There we go. The lowest price was: $39.99.
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)).