I have a RepRapPro Ormerod, which is sold in kit form by RS Components for just under £500 (+VAT where applicable). I'm fairly happy with it, although I have made major changes to the firmware (btw the electronics is based on the Arduino Due), replaced a few acrylic and MDF parts by aluminium, and replaced the original unmodulated IR height sensor by a combined modulated IR + ultrasonic one (and I have sold around 50 of these to other Ormerod users).
Printing large parts with a 3D printer is slow, and therefore expensive in machine time. 3D printers are great for prototyping and for small production runs, but for a large production run (hundreds or thousands of copies), you will want to use injection moulding.