My phone has been refusing to hold a charge for a full day lately. Typical, I was thinking, that's built-in obsolescence for you. My phone contract had only expired in June and it seemed that no sooner was it out of contract than it needed replacing. So, much googling, and checking out of new phones, and railing against the increased monthly cost of a new plan and handset, and calculating whether I was better off just buying a new phone outright, and comparing phones, and carriers, and... finally decided on phone / plan / carrier combination, still fuming over the expense and the trouble of re-downloading all the apps that won't fit on my SD card - and then it occurred to me that I could always just buy a new battery for my current phone. And $8 on ebay later I had done just that.
But I am nothing if not perverse, and now I feel quite disappointed that I'm not getting a new phone.