Are there any flutherites who read mangas and know of an e-book that would be able to download mangas?

My sons birthday is coming up and I know he loves to read mangas. He is always traveling and so I thought he would enjoy an e-book so he can read when trapped on long flights.
My only problem is he loves to read Mangas as well. I know the nook comes in color for magazines but I do not know if that covers Mangas as well. I would like to hear from someone who already uses and e-book to read their mangas.
If you can list some sites that have a large list of Mangas that can be downloaded for e-book, that would be great as well.
Not having any luck researching it.
Thanks.