It's a big one, and it's here on homeschoolshare.com. If you're not familiar with lapbooks, a lapbook is generally mounted in a manila folder, as a sort of "learning scrapbook" about a subject--often with 3-D components like pockets, accordion-pleated booklets, etc. My kids love them. (Here in Uganda, where I can't easily access manila folders, we actually use dismantled cereal boxes with the picture side covered in paper!)
Homeschool Share is the king, in my limited exposure, of free lapbooks on subjects from character to science to history to literature to social studies. They've got a lot that will work with our science curriculum this year: whales, coral reefs, mollusks... Worth checking out.