Not sure of his reading level but my 8yo is reading the Sonlight intermediate 2 books. He could read higher but gets frustrated if it's hard (m)

They are interesting stories. I just get them from the library. Here's the link
[www.sonlight.com]

I also bought old readers used. I remember them from back when. Here's a list of all of them.
[searchworks.stanford.edu]
Reading is Fun is for the second half of first grade than it's two books/year. My ds is working on A Magic World.

I bought them for like $.97 on Amazon.

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Lisa, mom to Emma, Spencer, Connor, Lily, Fletcher, Amelia and Adeline

"Raising children is like making biscuits: it is as easy to raise a big batch as one, while you have your hands in the dough."
E.W. Howe