We haven’t done the tip of the day for a while, but here is one for you: negotiate!
My wife and I went shopping for some camping gear this weekend. We bought two sleeping bags and a three person backpacking tent.
The total retail price was about $600. After some haggling with the store manager we got the price down to around $500 along with three free pocket knives.
So the moral of the story is: don’t forget to negotiate. It can save you money.