With Cupcake -> Replicator -> Replicator 2 the devices are getting physically larger and more capable. Larger machines are more expensive to manufacture and assemble, and this is still a small-volume, mostly hand-assembled (in Manhattan! {edit: sorry, Brooklyn. I misremembered.}) industry.
If you want a 3D printer and cash is an issue, look to building your own Reprap. Assuming you get it right the first time and don't need to buy tools, a total cost of under $500 for a Prusa Mendel is achievable. Obviously you have to build it, but given the target market that's often not a problem. Most people who want to build 3D printed stuff are generally happy to assemble robots too.
If you want a 3D printer and cash is an issue, look to building your own Reprap. Assuming you get it right the first time and don't need to buy tools, a total cost of under $500 for a Prusa Mendel is achievable. Obviously you have to build it, but given the target market that's often not a problem. Most people who want to build 3D printed stuff are generally happy to assemble robots too.