Most FAA handbooks are available online for free as a PDF. Here is the W&B book:
https://www.faa.gov/regulations_poli...A-H-8083-1.pdf

If you are building or doing maintenance it's a good idea to have the following FAA books: AC43.13-1B, Airframe, General and Powerplant Handbooks

I don't know if the FFA had free books.