I finally couldn't take it any more and bought myself a bike (sorry for the blurred photo, but you get the idea). Not the high-speed tourer I'd like to get—with any luck, if I really budget myself I'll be able to buy one of those in a year or so—but a "mamachari" (from "Momma Chariot", I guess): it'll get me around town, and I can get a little bit of exercise and let off steam after (more likely before) work. And it was only ¥15,000, a little under $150.