Use some of the activities in Algebra Experiments 1 and Algebra Experiments II published by Addison-wesley. ISBN 0-201-81525-7 and ISBN 0-201-81524-9, respectively. I've used many of these activities without the CBL and would love to try them with CBL for even better results. Both available in all the usual teacher sources, such as Dale Seymour, etc. Book I is linear and book II in non linear. Each is arouhnd $15 or $16.
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-- Linda Dodge Math Consultant Frontier Regional High School South Deerfield, MA