IMHO the 300-400$ printers off the shelf at the moment are complete crap. Lets take for account the ORD Bot(which should be the example for good price/quality printer in the lowest price bracket), its like 450$ for the kit. No extruder(40-150$), no electronics ( 150-200$), plus glass bed and heated bed up to 60$, 1 roll of filament(it's never only one
to get you started - 35-45$, PSU from 25-80$ and another at least 50$ in extra hardware and wires. So the total is in let say average 800-900$ to get you printing comfortably on a good printing platform. You can go dirt cheap with those 200-300 dollar printers but you will experience massive amount of problems(no matter what they tell you) starting from something simple as the cheap lead screws, nuts, under performing extruders, bad filament quality, dirt cheap shit quality bend, chipped, wrong size drilled plates(progware comes to mind), and the list goes on and on. So at the end is pretty much you get what you paid for. You cant produce quality product for this amount of money no matter how much we all would like to see cheap 3d printers.
P.S. Mark my words this Robo thing will be worst then the QU-BD extruder story, but again you get what you paid for.