I bind my own. It takes some time, but the result is a notebook that has the paper I want in it, that lays flat so I can use all of every page (I'm a lefty), and that I don't spend too much money on.
Moleskines are $$ for a pile of paper. A few minutes and an upholstery needle and I have graph paper, light-weight blank, and watercolor paper bound together just the way I like it.