I'm looking for sources of unique dinnerware with any of the following
themes (I'll need at least 4 full place settings)
*  Manhattan scenes
*  Trains/subways or transit-related
*  Monkeys, apes, orangutans
*  Cityscapes/urban
*  Maps

I'd like to know where to find pictures of such dinnerware and
specifically where to order and the best price.

Try www.replacements.com.  If you type maps in the search box there
are several unique patterns, with photos, from which to choose.  I
didn't see anything regarding Manhattan though.

I hope this helps.  Good luck.