I've been pretty lucky w/ money lately...I have three instances as evidence.
1. I may have mentioned this before, but I've always like those dog beds with the walls, and I wanted to get Dwight one. But they're typically really expensive. Well, we finally found on at Target on sale for $26, I think, but when we brought it up to the cash register, it rung up as $6.
2. I recently went to Urban Outfitters and saw a purse I liked. It was on sale for $29.99, which I felt was still pretty expensive for a purse. So I decided I would buy it for now, take it home and try it on with some clothes to see if I really liked it. But, when I brought it up to the register, it rung up as $10.
3. Today, me and Aaron went to Petsmart to return some glucosamine tablets that we had bought for Dwight. They were $46.99 when we bought them. When the lady was making the refund, for some reason it rung up as $54.99. I told her she was refunding us too much, but she didn't seem to care. So we made $10 out of nothing! Score.

That is $50 worth of profit there. Not to sound like Uncle Moneybags.