Amazon with Apevia has the Apevia ATX-PR600W Prestige 600W 80+ Gold Certified RoHS Compliance Active PFC ATX Gaming Power Supply for $50 with free shipping.
Other Brands Power Supplies - Best Deals and Sales
Ends 8/15 at 10PM PT. Sellout.woot! has the Antec Earthwatts Gold Pro Series EA750G Pro 80 Plus Gold 750W Semi-Modular Power Supply with 120mm Silent Fan and PhaseWave Design for $53 with free shipping for Amazon Prime members or $6 shipping.
Amazon with Bluetti has the BLUETTI EB70 716Wh/700W Portable Solar Power Station w/ Four 110V AC Outlets, Two 100W USB-C, Regulated 12V (Red) for $600 - $100 off coupon (check "Apply coupon" box) - $6 off with coupon code EB70RED01 [Exp 7/31] = $494 with free shipping.