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I've posted a number of Spanish-translations of "manga" (Japanese graphic novels) on my shelf for anyone interested. You can browse what I have by going here: http://tinyurl.com/62urjcn (sorry, it was a long and messy URL) or by just going to my shelf and filtering it for "Comics & Graphic Novels."
They're all published by Grupo Editorial Vid, which for some reason is not in the PBS system so they don't have ISBNs and might not come up in a regular search for Spanish-language books. If you want an info on the individual volumes, please feel free to PM me.