:)Well, I will have to post this in a few seperate sections, because my internet seems to be messing up. We usually spend 300-400 dollars a year on three children, two of whom are in middle school. Mostly, I use thrift stores, second-hand bookstores, homeschool classified ads, discount sellers such as Rainbow Resources, which is excellent for all ages; E-bay and Amazon (for used books). Here is a list of free and inexpensive resources and links that I have found useful:
http://www.homeschoolingonthecheap.com/
www.homeschoolclassifieds.com/
http://www.thebooksamaritan.com/ (a non-profit organization that sends books and materials to families in need)
www.curriculumshare.com/
http://www.eyewitnesstohistory.com/
http://oldfashionededucation.com/ (lots of links to free textbooks, mostly public domain and a free curriculum guide that uses these books)
http://happyheartsathome.blogspot.com/ (there is an excellent library of free textbooks, mostly public domain)
http://www.gutenberg.org/wiki/Main_Page (thousands of free public domain books, available to download)
to be continued in a minute...