Used Curriculum

If you are a member of HSLDA they have a great auction site. It's pretty easy to search for things too. Visit HSLDA then click on "Online Curriculum Market" you can search the site with out being a member but you must be a member to sell or buy.

Vegsource.com has a lot of used curriculum. However, it is hard to navigate. You really have to use the search to find what you're looking for on there. The search tool isn't great but works better than looking through all the listings. You have to email the seller to make sure the items are still available.

PaperBack Swap is a book swap program. It's free to join. You can also search this site without joining. You post 10 books you would be willing to give away and in return you get to pick books you would like to get for free. All you have to do is pay for shipping to the person who requests your books. Their search tool is great.

half.com is another good book site. It's comparable to amazon.com you just have to watch for high shipping charges.

New Curriculum

amazon.com
Children's Books
Christian Book Distributors
Homeschool Buyers Co-op the nation's largest purchasing cooperative for homeschooling families.
Library and Educational Services
Rainbow Resource Center
The Schoolhouse Store
Timberdoodle

Online Home School Curriculum

Time4Learning is a convenient, online home school curriculum that combines education with interactive fun.
CurrClick offers live homeschooling classes online.