If you want to try this maybe you can use the concepts of the Cyclone PCB factory to build a 3D printer for yourself

The old frames where made out of wood, you could always download the old plans and get the frame cut out of wood using laser or maybe you can cut it out by hand. Remember there are pros/cons to everything. You might end up spending so much time trying to get the thing to work correctly, but maybe you enjoy tinkering and it can be a hobby playing with the machine

http://reprap.org/wiki/Cyclone_PCB_Factory
https://groups.google.com/forum/#!fo...ne-pcb-factory

Looking at Printrbot you can get a full printer for the price you are talking about
http://printrbot.com/product-categor.../simple-metal/