Um, I don't have a changer, and don't plan on buying one in the near future--the car was enough! Therefore, I need to keep a few cds and cases in the passenger compartment, but the options on where to store them seem to be few. I'll check out under the passenger seat--thanks! Tthe armrest location seems quite precarious but I'll look into that also.
I have a case from a company called Discgear. Really cool. It's a circular disc shape (no suprise here) and unclamps at one of either side to open up accordion style. The single holds 24 CDs and it's a lot more compact than a CD book. Roughly the size of 4 jewel cases stacked.