6. Go to Your Local Library.

5. Borrow From Friends.

4. Google Books.

3. Check Out Paperback Swap.

2. Check Out Blogs for Giveaways and Contests.

1. Host a Book Review Blog.

via loveromancepassion

1. Bookins

2. BookMooch

3. Paperback Swap

4. SwapThing

5. Title Trader

6. Zunafish

7. Readers United

8. Frugal Reader

9. WhatsOnMyBookshelf

10. Novel Action

11. America's Bookshelf

12.Swap Simple

list part I via examiner

Part II via examiner

via elanso

1. Bibliomania
2. BookCrossing
3. Bookins
4. BookMooch
5. Childrens Books Online
6. Google Book Search
7. Memoware
8. PaperBackSwap
9. Project Gutenberg
10. SF-Books
11. socialbib
12. SwapThing
13. Title Trader
14. Wikibooks
15. World Public Library
16. WOWIO
17. Zunafish

via creditpanda

Bookswapping

• Bookmooch
• PaperBackSwap
• Readers United
• FrugalReader
• Title Trader
• Bookins
• WhatsOnMyBookshelf.
• Novel Action
• ReadItSwapIt

Bookhopping

• BookCrossing
• America’s BookShelf
• BookHopper

Really free books

• Library
• Friends, family, neighbors, classmates
• Free ebooks include Project Gutenberg and Free-ebooks.net.

Other options

• BooksFree
• Zunafish
• Thrift shops.
• Swapbooks
• half.com
• LibraryThing

via zenhabits