You've heard good planners and probably any DIYer say, "Measure twice, cut once." I've decided this can apply to other areas of your life such as being a good friend and picking up stuff for a coworker @ Costco.
Case in point: yesterday, a coworker asked me to pick her up a
Blackberry when I went there. She asked if I'd have the money and I reassured her that it is not after the 15th of the month so I could pick it up for her. My inside voice was saying, "
Don't you want to buy that yourself? That's a pretty big purchase?" She said that she thought maybe she had the cash for it in her purse and pulled out a $10 bill. Now my inside voice was wondering how to gently break it to her that you can't purchase a Blackberry for $10.
When I asked for clarification, she wanted blackberries-you know, the fruit. Two packages for $7.98 and we're happy. Again, measure twice, cut once! It tends to be a bit cheaper.