I really like Critical Thinking products. We have used several of them in the past. They are perfect for putting in workboxes, too.
Right now, you can get all these eBooks downloads for FREE when signing up for their monthly newsletter. I immediatly received my eBooks to download and also received a 5.00 off coupon (to be used with a 60.00 order) via email.
It’s a $32 value – yours absolutely free!