The biggest cost for a v2 is the hotend/extruder, or, potentially the control board. (I use Duet control boards, so thereās my biggest cost right there. 
) Then add in the power supply, a heated build platform, motors, a Z probeā¦
If you already have a 3D printer the printed parts are easy enough, but a makerspace could probably pump them out pretty easy, too.
A rough estimate buying from Amazon:
- control board (Something like a MKS Gen L RAMPS compatible w/ DRV8825s) $75
- Hotend (Like a MK8) $75
- Heated build platform, 200x200 $35
- PSU (LED style, 12 or 24V) $45
- NEMA17 motors X4 $80
- M8 rods, LM8UU bearings $50
- BLTouch probe $40
- plastic filament, 3/8" plywood, misc wiring and switches $???
If you have stuff around, maybe close to the $400 mark. I think that I could build one from my scrap pile. Well, I might not have a build platform, or the 8mm rods/LM8UU bearings.