Try Escient at
www.escient.com. The problem is that most of the megachangers have been replaced by HUGE hard drives. One store in Beantown sells daisy chained 1 TB drives as changers, with chains up to 10 TBs. That is a HUGE number of CDs. The "real disc" changers are a thing of the past and will probably be gone totally in a year or two.