I was invited to Kindle Direct Publishing‘s hardcover beta program, and have made my geometric algebra book available in black and white hardcover.
As always, the PDF, leanpub edition, and latex sources are also available.
I thought that it was too confusing to have color and black-and-white editions of the book (color has a significantly higher printing cost), so I have unpublished the color editions of the book (softcover, and hardcover). There is one copy of the color edition left, and once that is sold, it will show as out of print.
Placed an order for the Hardcover though it may take a few weeks to arrive here in Cyprus. I thought Canadians spelt colour the same as the British, though I see you use color?
Feel free to reach out if you have questions.
I generally boycott Canadian spelling, as American spelling seems more logical. In this international age I think I can get away with it (although it really annoys my wife.)