There are lots of artbooks at Kinokuniya. Expect to pay premium prices--if you compare the yen price to the dollar price, it's a joke even if you account for the fact that it's imported. Plus they may or may not let you flip through it.

For that matter, non-Japanese chains like Borders are starting to carry some artbooks, but only a handful. Check in the manga section.

It would be difficult to recommend artbooks to you unless we had a better idea of what styles you like.