In addition to ebay, I have bought used curriculum by searching for used curriculum on the Internet, such as here:
http://www.wtmboards.com/saleswap/
I also have found some interesting free resources on-line. Search under "Free Stuff"
I am a big believer in reading together--the great classics--I have several books that list really noteworthy books "Honey For A Child's Heart", "Books Children Love" We used the library frequently and have shelves and shelves of books in almost every room.
There is a philosophy that believes in delayed formal academics until sense are mature (around age 8). Dr. Raymond Moore is an author worth reading in this regard. That means lots and lots of reading together and activities together without the pressure of pushing math and writing, etc. if they aren't ready. Again, check the Internet for some articles about this approach, if you would like.
Sorry that you have had unpleasant experiences with the Christian hsers in your area. I have met many that are not as fanatical. I have been involved in 3 different groups but now we go solo. The A Beka curriculum is an advanced curriculum (about a year ahead of Canadian public schools, so likely even more ahead of US schools, lol) but very patriotic American in tone at times.
But those hs conference curriculum halls are a great way to pick up some really fun and interesting stuff.
All the best,
TS