Looking for 2nd grade level replacement for The Lion, The Witch, and The Wardrobe

Hello,

I am a 4th grade teacher, and I have a few students who read at about a second grade level. The whole class is getting ready to read The Lion, The Witch, and The Wardrobe. I would like to chose a book that is better suited to their reading level, but also has similar fantasy themes. It is a group of all boys. Thanks in advance for all your suggestions!