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If in Minato-ku, I can suggest the "Bike Recycle" sale, held on the second Sunday of each month. Most are your usual Mama charis, but they have a number of road/city bikes for which you must janken. All bikes priced around 9000yen. I managed to get myself a reasonable single-speed to get around town. More info here - be sure to arrive before 10:30 to complete registration.
@theBlob Yes - they are the abandoned bikes. I think many (but not all) municipalities have such a system. I tried a quick search but could not find anything for Nerima-ku.