An option to spending so much money and still using this book is going through the experiments and figuring out which ones you can accomplish without buying the kit. The downside is that if you want to purchase a kit of supplies, you’ll be set back by over $200 or so. It’s also quite rigorous and includes a variety of biology labs covering a lot of different subjects. The benefit of the Illustrated Guide to Home Biology Experiments is that the text is FREE. The Illustrated Guide to Home Biology Experiments Free Homeschool Geography Online Textbook.Free Homeschool Biology Online Textbook.Free Geography & Cultures Online Textbook.Guest Hollow’s High School Biology Online Textbook.Free American Government Online Textbook.Government, Economics, and Personal Finance.