Let's see, tips to avoid overspending. If you have a credit card on file with, let's say, Amazon, remove it from the file. That way, you have to go get your purse, and do all the typing, and it gives you enough time to think.

Freeze your credit card. Literally. Wrap it in plastic,stick it in a bucket of water, and freeze it in a block of ice. This way, you have to thaw it out and it gives you enough time to think about what you are purchasing.