The Algebra Lab: High School (written in 1990, available below) has many great lessons, some of them available nowhere else, and offers a good introduction to the Lab Gear for teachers. Much of it is merged into the textbook Algebra: Themes, Tools, Concepts, also available as a free download on this site.
This book is not as easy to use with students as the Algebra Lab Gear books from Didax, and it does not include lessons involving the 3D blocks. Still, it contains many activities I recommend for classroom use. In particular, check out the Explorations. (See pp. ix-x in the front matter for an overview and index of those.)
Download any or all of it for your non-commercial use.
The Algebra Lab: High School
A comprehensive manipulative
program for Algebra 1
by Henri Picciotto
- Meeting the Algebra Lab Gear
- Computing with Signed Numbers
- Getting to Know the Lab Gear
- Simplifying Algebraic Expressions
- Multiplying and Dividing
- Combining Operations
- Solving Equations
- Factoring
- More Equation Solving
The whole book (searchable)