If you have a Dell credit card, you can save another 3%. Just log in to your account, and at checkout, select regular credit card as a method of payment instead of Dell credit card, and they'll offer you a 3% discount if you switch back to Dell credit card as method of payment.
Also - Not sure if it its just me, but checkout always crashes on me with Google Chrome, so I have to go in through Internet Explorer to get it to work.