I don't know about your students by my students are obsessed with the Bluford High Series
I can't keep them on the shelves. The boys and the girls check them out (sometimes they never make it back).
I found out that the publisher http://www.townsendpress.com sells them for DIRT CHEAP>
They have them (and other books) for for $1 each or $20 for all 20 books in the series.