Looking for free reading books for 4th grade boy.

[wagnfun]

I'm looking for a list of reading books for my 4th grade boy to read on his own at his grade level. I originally thought we could just pick up suggested SOTW readers on the chapter we're on but I"d like to hear what other 4th grade boys like to read.

Thanks for any input. I'm trying to put together my year at a glance!