It's nice for my time to be valuable now. This really wasn't the case a few years back. A few years back, it was worth my time to search a dozen different sites for the best price on something. Now it generally isn't. Sometimes I forget this, and spend an hour or two Googling as hard as I can looking for a good deal, before I realize how absurd it is. I could be using that time to do something fun, instead of searching for deals, something only slightly amusing. I think that part of the problem is that I do enjoy shopping around for decent prices at least a little bit. Because it's mildly fun, I don't realize until it's too late that I could have used that time to do something much more fun.
Most of the time now, I just go to Deep Discount CD, Deep Discount DVD, GoGamer, NewEgg, or Safeway, and buy whatever I'm looking for there if they have it. In case they don't, I go to Amazon, who almost certainly will. I'm sure I spend a couple extra bucks now and then, but certainly not enough to go shopping around.