Be aware that the Homeschool Buyers' Co-op has this for $105 instead of $150. Still pricey, but not nearly so much! Anyone can join the co-op--afterschoolers welcome! They often have some really good deals.
https://www.homeschoolbuyersco-op.org/index.php?option=com_epp_offer&Itemid=689Note also the FREE math videos--pre-alg, algebra, & geometry--if you use the 100 Smartpoints that you get for joining the co-op:
http://www.homeschoolbuyersco-op.org/hotmath-school-videos/Sorry for the "commercial" (har har!), but it seemed relevant to the discussion.