I am looking to buy about 10 hard book covers to create photo books with.
I got the idea from this website: http://www.digifilmlabs.com The
books need to be the same size (8.75" x 11.25") and must be made out
of linen or similar cloth. It would be preffered if the manufacturer
sold additional colors additionally to black . I will only accept
ordering online, so the manufacturer must have a website that you can
order on. I am looking for the cheapest I can find them without going
through a reseller.

Is this the sort of book you are after?
http://www.imagestation.com/photo-gifts/photo-books/linen-landscape-double-sided.html

Yes, they are also sold on www.mypublisher.com. However, I do not want
to have them printed and bound. I want just the covers from the
company that would produce them.