I just got my P7 on Tuesday from Best Buy. I am an AMEX card member, and they're running an offer where if you spend $250 or more at Best Buy before 12/31, either online or in store, you get a $25 credit back to your account. This offer will be listed under "Offers For You" when you log into your account. So it basically nullifies the sales tax that they charge. I was able to get mine with an in store pickup for $403 after my credit back. And they were really fast with the credit, it has already appeared on my account as of today
Hope this helps everyone on the fence who happen to have AMEX! These are the best pair of headphones I've owned thus far, and I hope to spend many years with them.
PS: For those worried about the case, its beautiful and protective, with a magnetic enclosure. Real stitched leather that smells like the insides of a Bentley! Totally befitting the high class of the P7.
Cheers