Here's my book Garden to Seed where I cover off the basics to get you started saving your own seeds at home. This is both rewarding and cost effective.
Chapters:
Introduction
Getting started with seed saving
Selecting the right varieties
The basics of seed saving
Saving seeds from each of our 5 easy crops
Seed cleaning and storage
Troubleshooting
Expanding your seed saving skills
Final words
Appendix (resources)
Glossary