I'm assuming you are working on an old Gary fisher? Gary Fisher (and a very few other rare manufacturers) used to use some gawd-awful BB which was pressed and clipped in. You need a special shop too to replace it, you can't do it with ordinary handtools. These BB's were not very popular (or durable), and may be obsolete by now. At the very least, expect to wait for one to be ordered, and expect the bill to be in the vicinity of $100 installed.