I need to replace the cam chain on my bike. I've read all the posts about doing it. My question is how often does this occur? My bike has around 1200 miles on it. I have not found a dealer in my area that has one in stock,and they all want $50 to order it. I have found them cheaper online,but then they all want $15 to ship,so back to $50. I find it strange that with the amount of people here that change them,the dealers don't stock any. Anybody want to chime in with their approximate mileage or how often their doing this.