Someone asked me about books for males in that tween age. I don't know of anything in Christian fiction, but I do know about the Bluford Series. I purchased the first 13 for my son years ago. Lots of educators use these books in the classroom, and they really are good values based literature. There are 15 books in the series and get this? If you order from the publisher's website it's only $1 per book. I'm not kidding. $15 plus minimal shipping.
Here's a little about the series:
The Bluford Series is a collection of FIFTEEN young adult novels that focus on the lives of a group of high school students and their families. The series draws its name from the school which many of the characters attend: Bluford High, named after Guion "Guy" Bluford, America's first black astronaut.
Set in contemporary urban America, each novel addresses complex topics relevant to the lives of today's students: family, friendship, trust, isolation, violence, and peer pressure, to name a few.
In addition, the books feature male and female characters and include elements from many literary genres, such as mystery, suspense, romance, and a touch of the supernatural. In other words, the Bluford Series offers something for almost every reader.
Check it out by clicking here.