The Company on your list that has me the most disappointed is Scholastic.
As a HS mom, I have been able to purchase books through warehouse clearances that I may not have been able to afford otherwise. They have been a valuable resource in the past. I hate to have to let them go.
And for you PS parents, Scholastic is the monthly book magazine that your teacher sends home with your child; offering you the opportunity to purchase books at a substantially lower cost.
Just an FYI for future reference
http://www.bookfinder.com/ new and used book search engine to corporate and individual book dealers.