I tend to upgrade rather than buy new bikes, so as stuff wears out it gets replaced, and apart from the road bike which is c2w and therefore boring, every bike in the garage is Trigger's broom. Sad though it sounds I know pretty well where to go to get any bike part at best price, with a mental list of where to check for recent bargains just in case. By trawling classifieds I have a reasonable idea of how much to expect for the stuff I have to sell, so I have a pretty good idea of what an upgrade will cost before I start saving. Obsessed? Moi?