I've got a couple of Raspberry Pi Zero's that emulate a mass storage device (basically it acts like a USB drive) that I have connected to 3D printers and my wife's embroidery machine.
Instead of using it with a network share like in the link, I share the folder with SyncThing.
It's super convenient to not have to move a USB drive around and can just leave it connected and get the files on there seamlessly.
Not sure if you know about Slickdeals, but there are a few, including that Bambu listed:
Bambu deal
AnkerMake m5
There are a few more of you do a search for '3D Printers'.
I picked up some filament ... not the greatest deal out there, but it was decent enough for me.