I don't know what prompted me to do it, but I went and checked some of the PASS books links on the Wayback Machine. In particular, mathematics. Pre-Algebra was there. Mathematics 2 was there. Algebra? Nope. Click on one of the algebra links and you get an error message. Oh, joy.
But, there is some good news. First, SAS just launched a new Algebra 1 course. (Scroll down a little on the page and there's a box on the right-hand side of the screen you can click on.) Second, between CK-12 and Khan Academy alone, there's lots of algebra stuff available, even without the PASS book. Don't forget, too, that you can still order the CDs for free and get the PASS algebra 1a, 1b and a third book just called "Algebra 1," plus their TEs.
Meanwhile, as soon as I can, I will check all the Wayback Machine links and make sure they are working, or pull them their corresponding HC USA page.