12 grids = minimum
16 grids = a great floor size
36 grids = if half of floor space of 16 grids has second floor

1 grid = average of 85 cents US$ (or correct me)
36 grids = average of US$30.6 for a great one (or correct me)
(not including ramps, racks, accessories, toys and bowls)

Where to find them: Click <a href="http://www.cavycages.com/cubes.htm" target="_new">here</a>
The best way to do before you plan for a cage is to completely read this site, its worth reading for.

[/b]<a href="http://www.theministryofmagic.org.uk" target="_new">The Ministry Of Magic</a>[i]