Have a look at my gallery on http://www.kochigallery.com/#!comics-japan/c1r18. I offer hundreds of original anime cel and sketches from anime such as Dragon Ball, Saint Seiya, Captain Harlock, Akira, Sailor Moon, Galaxy Express 999, City Hunter and many others! You may find something you like there!
Edit
we have updated our website, which now comprises more than 200 anime celluloids and sketches!
