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.
This book is not as easy to use with students as the Algebra Lab Gear books from Didax. 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
- More Equation Solving