See title. I'm at least somewhat interested in getting a 3D printer, but...

1) How much does a decent one cost?
1a) How much does the printing material cost?

2) How much space do they take up?

3) How tough are they to use?

4) Can I use Blender with them?
4a) And any Blender tips for better modeling?

5) Anything else I should know?