That's about the going rate so a good deal, the only puzzling component is the RAM it's a bit on the slower end of DDR4 and Ryzen CPU's love RAM. That said it looks like a nice rig that'll play games in higher settings overall you got a deal.
i did wonder about the Ram, but after watching numerous videos on YouTube the general feeling is diminishing returns after 2400mhz. Also, I game at 4K or 1440p 60fps (on most new titles) single player so I’m not really too bothered about 144hz etc.