Currently DJ have 20% off dyson so the dc54 is on sale at $639 and for today only they also have a additional 15% off appliances if you spend over $100. But those that have registered for the Amex cash back can get another $100 cash back if you split the payment.. For a final price of $443.32. I am not sure if this is a mistake as I had to show the website discount on my phone for the guy to give it to me at $543.32.
Link to receipt
http://img200.imageshack.us/img200/9412/q5ze.jpg
So how did you exactly get $443? I got $543.32, so less 50 for amex is $493.32?