2017 Update: links updated
This is a terrific find! The Scott Foresman site offers a free grammar & writing curriculum for grades 1-6 (separate “handbooks” for each grade).
The books are broken down into lesson-sized links, making downloading (to .pdf) quick, and printing convenient. The lessons are written in a large font with black and white graphics included.
Scott Foresman Grammar & Writing Handbook, Grade 3 (this is a different source than the others)
Update April 2017:
A reader wrote: Here is a link to a Dropbox with all 6 of the Scott Foresman Grammar and writing Handbooks. It’s always nice to have more than one location to find them. It is on Google Dropbox. The link was found on the forums for Welltrainedmind.com Jan 2015. It worked today on 4/13/17.