Please take a look at our (Fusion3) 3D printer - the F306. We have a number of customers who are using the printer instead of going the injection molding route.
Large build area (12x12x12") allows for many parts to be printed at one time (arranged on the bed). Combined with our speed and great print resolution, you'll get great results.
The single extruder printer is $3975, we can also do a 'high flow' (larger nozzle) version which sacrifices some print quality for even greater speed.