when I home-schooled my son, it was during the 90's when the 'multicultural connection' in every textbook added hundreds of pages of useless crap and thousands of dollars to the pricetag for school districts.

Find a homeschool group in your area and go to the book swaps. I concentrated on Catholic school texts for all subjects. No matter how old the civics or world history text is, it is easy to find sources bringing the topics up to date. just updating the old maps is a lesson in itself. I really didnt like the prepackaged homeschool plans. the old english grammar books are easy to use, spelling lists from back in the day will be more challenging, and the reading lists from pre-90s are so much better than the drivel they hand out now.

ebay is a good source too. good luck. .