Homeschooling inexpensively is not an impossible task. With the volume of information on the internet today it is relatively easy. You just need to know where to look. Obviously, sites like National Geographic and The Discovery Channel are invaluable, but have you ever heard of 42explore? There are a wealth of educational sites that are adaptable to homeschooling. Do a search for education k-12 and you will come up with thousands of hits. Each of these sites have many links to other interesting sites. The only problem is trying to decide which site has the best info for you. You can create an entire curriculum from online resources. Here's an example:

Literature: Gutenberg.org
Math: AAAMath.com
Science: Awesomelibrary.org
History: Besthistorysites.net
Grammar: Eduhound.com
Vocab: Vocabulary.co.il
Spelling: Education-world.com
Geography: Atlapedia.com
Bible Study: Crosswalk.com

I use Gutenberg for 80% of my literature curriculum. We also get our History, Geography and Science lessons online. We already have a math worksheet generator.(which you can also generate online) We don't do spelling, grammar or vocab drills, but instead incorporate that into our literature study.

Using the internet can save you lots of money but you have to make sure you meet your state requirements. The requirements in our state are pretty easy but some are more rigid. Make sure you are maintaining the proper documentation for your state.