A friend of mine sent me this cool site - Freebie of the Day - you can sign up to receive their posts by RSS and never miss their daily giveaways. (Thanks Debbie!)
This is another site I've been getting things from for about 6 months now. They just changed the name of it a few months ago to CurrClick. Once a week they will email me and let me know I can go to their website and download one free homeschool lesson/book, etc. I have gotten some amazing lesson plans from them. For example, yesterday's lesson was a 30 page copywork notebook on "The Declaration of Independence: The Cost." It discussed the details of what happened to the original signers of the Declaration...the price they paid.