You can now buy a hardcopy (already printed version) of any of the 16 "BLUE" series Math Mammoth books.
These are found at Lulu.com - at the address www.lulu.com/mathmammoth/
The drawback is, they're black-and-white (or grayscale to be exact). This is because the price per page for color printing is quite high and I figured no one would buy the books then. As it is, the b&w versions cost around $8-$11 each.
Lulu.com provides on-demand printing for self-publishing folks (such as me). They have a nice service; you can even print calendars and other stuff and not just books.
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