Newegg has CORSAIR RMx Series RM850x CP-9020180-NA 850W ATX12V / EPS12V 80 PLUS GOLD Certified Full Modular Power Supply for sale.
$129.00 - $10 Coupon + Shipping ($1.99)
promo code 63FANTECH265
Please note that this is a 2018 version. It performs almost as well as the newer 2021 version with the following changes:
Magnetic levitation fan for increased lifetime under high operating temperatures
Modern standby compatibility for fast wake from sleep times
High efficiency under very light and light loads
Three EPS connectors with the 1000 W and 850 W units
Cybenetics and 80 PLUS (in the reviewer's guide) certifications
I personally prefer the 2018 version because of quieter fan. Here are tests performed by cybenetics.
RM850x 2018: Avg Noise Output 19.12 dB(A)
RM850x 2021: Avg Noise Output 29.72 dB(A)