>>105971280
Usually several hundred dollars. Example:

The cheapest 5070-based prebuilt I found on Amazon:
https://www.amazon.com/HOENGAGER-Hoengaegr-Panorama-Gaming-PC/dp/B0F1Y88FD7?xpid=HaBRaTJreFmZj
5070 12GB RAM, 5700X, 32GB DDR4, 1TB SSD, 650 PSU, Windows 11 - $1380
Most others are $1600-1700+

Speccing out the same or better parts separately:
https://pcpartpicker.com/list/RBwqfd
Roughly $130 saved and with a larger PSU for expand-ability and a faster CPU in the 7700X w/DDR5 RAM