You may have noticed that our website was down for several days recently. We apologize for any inconvenience this may have caused. We have restored the site and it is functioning properly again.
Due to our website outage, we are extending our site-wide Black Friday Sale! Most of our titles are discounted, with only a few exceptions. Sale prices will remain in place through December 7th.
Shop Books • Most full-size books are discounted 40%
Shop Mini-books • Mini-books are discounted 30%
Shop eBooks • Most ebooks are discounted 40%
Find discounts across all of these categories: