HP i5 $599 at Costco. Deal back thru 8/24/2020 $599.99
Costco Wholesale has HP Pavilion Desktop (TP01-1127c) on sale for $599.99 valid for Costco Members only. Shipping is free.
Note, must login to your Costco account w/ an active membership.
Intel Core i5 10400F 2.9GHz Prcoessor (10th Gen)
256GB PCIe NVMe M.2 Solid State Drive SSD
12GB DDR4 SDRAM (2666MHz)
1TB Internal HDD (7200 RPM)
AMD Radeon RX 550 2GB Graphics
WiFi 5 (2x2) w/ Bluetooth 5.0
USB Wired Keyboard/Mouse
310W Power Supply
4x USB Type-A (SuperSpeed)
4x USB 2.0 Type-A
1x USB Type-C
For those with a Costco Citi card, 4 year warranty.
Note: Sounds like it is not ready to add another HD.