They are all over the place, best to google refurbished business desktops. For the GPU, this is one thing we can thank the crypto miners for, you can buy a $60 adapter that you can mount a GPU to an connect to the motherboard with an extension cable, they work great and allow for a much more flexable setup. Im actually using a full size 1050 ti with a small form factor PC usomg one of the adapter/extension things, i got mine on amazon: https://www.amazon.com/gp/aw/d/B07FD8QXFM?psc=1&ref=yo_pop_mb_pd_title apparently tge price dropped further.