My childhood copy had been tattered and torn to bits, eventually losing several chapters. The Teddy Bear Habit is one of those random gems of young adult literature. Set in Greenwich in the 60s and full of slang, cultural references and foot chases across Manhattan, it's far more hilarious than I realized as a kid.
Sadly, it isn't widely available. It was briefly re-issued in 2001, and luckily there are still a few of those editions floating around (like the one pictured here). The paperback 70s edition had fabulous sketched illustrations, but it seems impossible to find.