A group I've been involved with does business with
this company. Apparently they're about the cheapest the group can find. I don't know if they have a minimum order requirement or anything--if they do, it's no more than 3 digits--but in my experience their books stay in one piece, even if the image reproduction on the inside pages isn't so hot.
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My 5MV webpages My novel fivers list
Yup
“There must have been a point in early human history when it was actually advantageous to, when confronted with a difficult task, drop it altogether and go do something more fun, because I do that way too often for it to be anything but instinct.” -- Isto Combs