If you're looking to get a gaming PC for the first time, this isn't a bad place to start.
Techfast has a neat pre-built Ryzen system for sale through their eBay store right now. For $799, you can pick up a Ryzen 5 2600 system with a RX 580 8GB GPU, 120GB SSD/1TB SATA of storage, and 8GB of RAM for $799.
It's a good start for a gaming rig. The Ryzen 5 2600 is a great bang-for-buck CPU, and some extra investment around Christmas in some more RAM will make it a nice well-rounded gaming PC.
There's also a separate $999 bundle that comes with a 27" AOC 2700SWH monitor if you don't have one already. That in and of itself is not a bargain - you can pick up 27" AOC IPS monitors for $200 - but getting it in one package is convenient and can save you a bit on shipping. (If you want something with a better refresh rate that's still relatively affordable, this Acer 24.5" 144hz screen is worth a look.)
EBay Plus members will also be able to save a little more, but $799 to get all the base components pre-built is still a decent offering. The six cores should come in handy for productivity tasks as well, if you dabble in that. Head here for all the details.