A while back I bought two saw blades for my circular saw from www.Tools4trade.com. They sat on a shelf for a few weeks while I did other stuff. This weekend I was just about to put the first one in my saw when I realised that I had bought the wrong size.
I sent them an email asking if I could exchange them, and got back an email to the effect of "no problem, send us the blades and let us know what you need".
Wouldn't it be nice if everyone was this great.