Sometimes it helps to have a little direction instead of the trial and error of investigating groups only to find they are not what you were looking for. If you meander around Facebook regularly, you may find these groups are worthwhile checking into to swap homeschooling books and materials. Some of the groups offer the materials free, just for the cost of shipping.
This is something we investigated as a possibility for Schoolin’ Swag, and just decided it was not a direction we wanted to go in. So here is some help if you are looking to change things up in an economical way (aren’t we all?):
https://www.facebook.com/groups/HomeschoolFreecycle/ Homeschool Freecycle
https://www.facebook.com/groups/hsucs/ Homeschool Used Curriculum Swap
https://www.facebook.com/groups/239853779482578/ Used Homeschool Books and Curriculum for Sale or Free
https://www.facebook.com/HomeschoolBargainsAndMore Homeschool Bargains and More
https://www.facebook.com/groups/hscurriculumswap/ Homeschool Curriculum Swap
https://www.facebook.com/groups/158947230864513/ Homeschool Swap: Canada
https://www.facebook.com/TheHomeschoolSWAP The Homeschool SWAP
https://www.facebook.com/groups/138629366323079/ Homeschool penpals/postcard exchange/geo-cac/book exchange/activity bagswap
https://www.facebook.com/groups/222126747798926/ Homeschool Curriculum Marketplace
https://www.facebook.com/groups/215568998597147/ Used Homeschool Curriculum Sale
Also, check out our Schoolin’ Swag Pinterest board for websites outside of Facebook where you can buy, sell and trade homeschool curricula!