The Dollar Store
the dollar store has a surprisingly decent supply of workbooks and teacher supplies.Meg Grooms has several wonderful posts on dollar store finds, so i'll link t hem here and not reinvent the wheel
Homeschooling Bargains
Science at the Dollar Store
Oh, and this Gameschool blog has become one of my favorites, and has lots of posts with free printables and games and ideas as well.
Teachers Pay Teachers
Membership here is free, and you can narrow your searches down by cost, so you can search for resources within your current budget.
Back to School Sales
I love when our store has their annual back to school sale and I can get notebooks for 19 cents and crayons for under a dollar a box. I stock up on all the essentials; printer paper, markers, crayons, notebooks, pencils during these sales. Good news is my kid doesn't "need" a brand new backpack and lunch box every year.
Education.com
education.com has all kinds of worksheets and lessons. when I need to print off the odd worksheet to fill in a gap or supplement my curriculum I head here. Sometimes I use some of their worksheets when I just don't feel like doing a full math lesson that day. Or week. You get a limited number of free downloads a month. If you subscribe make sure to wait for one of their frequent 50% off sales.The Library!
Never forget your local library. Don't be afraid to ask for interlibrary loans or for them to purchase books for you. Some libraries can loan out homeschool kits, museum passes, games, puzzles, movies and audiobooks. Checkout your libraries website as well, many resources can be found there depending on what services your library has subscribed to. Look under Homework help sections and the like and see what's there. Not to mention family friendly activities (free field trips anyone?) Get to know your local librarians, they will serve you well.Thrift-stores
Books, games, art and experiment supplies, book cases and more can all be thrifted. Keep your eyes open, you know know.Friends of the Library Bookstore
If your library has a friends of the library bookstore, check it out! They often support a charity or the library and can have great deals on used materials.