Here are some more resources I found for free homeschooling:

Math/Science Nucleus — free K-12 science curriculum, includes lesson
plans, online animated storybooks, slide shows

Windows to the Universe — (K – 12)  free online tutorials, activities,
coloring pages, etc. on Earth and Space science, includes art, poetry and
myths  related to the sun and planets

Middle School Science — free online resources and lesson plans for
activities, projects and experiments

The Science House — free online experiments for Middle School science,
designed by NC State University

Pre-University Chemistry Course by the University of Oxford — includes
free online text and virtual labs
Virtual Chemistry from the University of Oxford — free online chemistry
labs, webcasts, and video libraries, high school level and up
The Chemistry Collective by Carnegie Mellon University — free online
collection of virtual labs, scenario-based learning activities, and concept
tests for use as pre-labs, homework, and in-class activities
The World of Chemistry — free online video series, 26 half-hour
programs, coordinated book and lab manual available for purchase

Basic Concepts in Geology — a tutorial from NASA

The BGS Geological Time Chart — click on a time period for more info  

Global Stratotype Sections — lists the geologica time scale and names
specific rock formations that are of that age

Stanford Computer Science Library — free online tutorials, videos and
applets for learning about computer science

Young Epidemiology Students — (9-12) free down-loadable teaching
units on epidemiology and other biology topics, also an annual  student
competition  

Merlin Science — offers Chemistry, Astronomy, and Genetics courses on
CD-Rom, high level science materials presented in a way that even young
teens will enjoy. Used by a few schools, too. Samples available to view.

NIH Curriculum Supplement Series — (K – 12) 2-week modules with
lesson plans and activities,ranging from tooth-brushing to cellular biology

UCMP K – 12  by the University of California Museum of Paleontology —
web-based educational modules and online resources to help students  to
investigate and understand the history of life, the fossil record, evolution,
and the diversity of the Earth’s biota

I.Science MaTe by the Math/Science Nucleus — (K – 10) free online kid-
friendly tutorials on various science topics, short and illustrated with photos

Virtual Text — (9 – 12) biology web modules and online texts, some free
some subscription

Amazing Space — free online tutorials and activities from the Space
Telescope Science Institute (the Hubble Space Telescope)

The Physics Classroom — free online physics tutorials written at high
school level

CoAST — free modules for studying marine and coastal environments

Scratch — a free download from MITof a new programming language that
lets you create your own interactive stories, games, music, and art, website
includes kid-friendly tutorials and “facilitorials”, aimed at grades 3 – 8

The Official String Theory Website by Patricia Schwarz

Try Engineering — free lesson plans for ages 8 to 18

Eyes on the Skies — a children’s astronomy tutorial with activities, from
Havard

Underwater Archaeology — visit dive sites around the world

The Lesson Plans Page — thousands of free lesson plans on all subjects,
including science and computers

Teachnology — over 25,000 free lesson plans on all subjects, including
science and computers

Rader’s Chem4Kids — free online chemistry tutorials and activities for kids
Rader’s Biology4kids — free online biology tutorials and activities for kids

Food and Nutrition — an extensive website that discusses all aspects of
food, nutrition, food processing, the food industry, food additives, and
agriculture, from the University of Saskatchewan

High School Biology in Your Home — an independent research
approach to high school biology, no textbook provided, students find info on
websites, in old textbooks, and using primary sources

The World of Chemistry — free online video series, 26 half-hour
programs, coordinated book and lab manual available for purchase

National Repository of Online Classes: AP — free, self-study, online AP
courses in science, math, and history

UCCP Open Access College Prep — free online AP courses, including
simulated labs for science classes, use as prep for taking AP tests

Connexions by Rice University  —  contains educational materials in all
subjects for all levels, from children to college students to professional.  
Information is organized in small modules that stand alone or can be  easily
connected into larger courses.  Connexions is an innovative environment for
collaboratively developing, freely sharing, and rapidly publishing scholarly
content on the Web.  All content is free.

Chemistry I – online course using Model Chem Lab virtual lab software,
thru the Florida  Virtual School, other subjects available

Biology Labs Online — a series of interactive, inquiry-based biology
simulations and exercises designed for college and AP high school biology
students.

Stick that in your eye public school proponates who say it costs $6800++ to give a kid a decient education!