Originally Posted by La Texican
Go to the Dollar Tree, not the bookstore.

I got most of our workbooks/flash cards/learning tools from our local dollar store (Deals). I just use what works from the books and don't feel pressured to finish the rest. I've also found scores of science books there that are theme-based (space, earth, body, weather) and at about 3rd/4th grade reading level (perfect for my ds). Our shore had a big teacher resource section with all kinds of yummy things.