I actually got my shift from Best Buy for 124.99 + $36. I started off printing off an advertised price from wal-mart that had it for $99.99. Took it into Best Buy and asked if they would match, they called the local wal-mart and they were told they didn't carry them in store. So they would not price match them. I told her, if she would sell it to me for 124.99 I would buy it from them, otherwise I was going to radio shack (Which just happens to be next door to my Best Buy) and ask them to honor the price or give me a discount. She went and asked a manager and he approved it.
I use to have a friend who was a car salesman, he always told me, "If there is one in stock there too much supply and to ask for a discounted amount". He would get discounts everywhere, even his apartment rent he negotiated a lower price.
Remember it doesn't cost you a penny to ask for a discount. Don't be rude or mean or seem uptight, lay out the facts. If you do A I will do B, if I'm not asking for a crazy discount 9 times out of 10 I will get it. Now if I could only talk Sprint to lower my bill....