Ikkichi wrote:Where would the best place to purchase a ticket online ? So that I know he will actually have one

I bought my tickets from this site:
http://www.jtbusa.com/en/other/o-ghibli.asp
Also, they do sell Laputa robot figurines, I actually
bought a small one for myself of his bust w/ teto flying
around his head. LOL!

But again, it was cheaper at the Ghibli store in
town rather than the museum-- I purchased mine
in Kamakura for about 2500 yen.
However, they do have them there at the museum.
As I'm sure bigger versions like the one you pointed out.