I noticed this at another site, and thought I'd pass it along. Scholastic is offering a slew of PDFs at $1 each, but the offer ends today: http://teacherexpress.scholastic.com/

I can't vouch for the quality, but you can view each one individually before buying, and content includes vocab and grammar, problem solving, etc.

Striving to increase my rate of flow, and fight forum gloopiness. sick