We finally decided to replace our old mattress when I couldn't sleep for a week and was waking up sore.
We went to one store, and spent over an hour laying on various mattresses, and taking up the sales lady's time (There was one other couple in the store who was not buying, and initially she split her time, but when we were all alone, she was attentive to us). The next day, we had decided on the one we were going to buy, but since it was going to be a several years' commitment plus quite a bit of money, I felt it would be responsible to shop around for price and "extras".
I stopped into another store, just to make sure that different individual mattresses of the same model still felt as comfortable, and to see what the price difference would be. Well, they did have a policy of beating any price by a set 5%, but a lot of the extras were actually extra. He went to get a calculator so he could tell me exactly how much we were going to save, but after a bit of quick math in my head, I determined that the price difference (considering freebies) was actually ~0.5% of what we would be spending, and frankly I just liked the other sales lady more. I figured if I can negotiate with this guy, I can negotiate with her. I decided not to waste the guy's time any more (I had been there for 5 minutes, I was the only one in the store), and thanked him for his time, but I didn't want to waste it. I said that the deals seemed to be roughly equivalent, and I wanted to honor the hours the other sales person had spent with us. He protested aggressively about why I would want to spend $XXX more than I had to (did not account for freebies), which I didn't respond to, but rather turned toward the door. He threw the calculator onto his desk in disgust. I wasn't particularly afraid, but the abrupt turn in his attitude so strongly turned me off, now every time I pass the store, I think "I'm never shopping THERE again!"
All's well that ends well. I went to the other store, told the sales lady that I was back because I liked her better, but I wondered if she could swing the 5% discount and meet the other guys' offer. She did. Now I have the opposite problem - I can't seem to make myself get out of bed, it's so great.