American Colossus still isn't available on Amazon, but I'm sure it will be by October of this year. In the meantime, you can still buy it through Lulu. The price will be the same ($29.99) in either case.
To date, 34 copies of the book have been sold. Two-thirds of them (22 copies) were purchased by Colossal Books (which re-sold 15 of them and gave 7 of them away to potential reviewers); and one-third (12 copies) were purchased by others through Lulu. To all those people who have bought a copy of American Colossus: thank you very much!