maybe for a little older homeschoolers but i thought someone else may need these flexbooks as i use them everyday. http://www.ck12.org/flexbook/browselist/
Thank you 
My students are 15, 8 and 6.
Susan Khan
i found this site interesting, thanks for sharing. flexbooks are new to me, though - can you explain how/why you incorporate them over other resources? thanks!
we use them as supplements or in place of textbooks. we are trying to go digital so this allows me to download them to a flashdrive for the students.
Many thanks mother of faith!