And now for the rest of the story. Saxon died, and the estate tax stole his company, i.e. it had to be sold to Harcourt/Achieve to pay the tax (more money for the Gibmedats, bureaucrats, and crony capitalists).
Harcourt is a member in good standing of the Ed Establishment, which hated Saxon’s approach because it didn’t conform to the ridiculous theories generated by the not-very-smart people who call themselves ed professors. So, Harcourt is ruining the series. The old books can still be found, but I wouldn’t buy the new ones.
“which hated Saxon’s approach”
They hated it because it worked. If something works, you don’t need to change it, especially a subject like math, which is static. It means you can use the textbook for as many years as it remains physically intact.
Harcourt needs “inovation” and “change” so they can sell new books.