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Recently i decided to get a new air tube - that bit that connects the bike pump and the tyre. The old one had started to leak - i think it had a crack in the rubber. I'm not sure when i got that pump, but i think i've had it since at least '97.
Anyway, the new connector cost me a grand total of $2.25. I figure that to be about 16 cents per year, which i reckon is a fair bargain - particularly considering i had a gift voucher for the store. :)