Enjoy!
Dell : Microsoft Corporation Xbox 360 Arcade with Rock Band 2 – Xbox 360 : XBOX 360 : Member Purchase Program
DPA trick:
1. During checkout, select Credit Card as method of payment
2. Click "Change Payment Type"
3. Click "Choose" link under Credit/Debit Card (again)
4. Under "Save 3% (4% at EPP) with Dell Preferred Account! (Discount applied at Final Checkout)" click "Click Here to Take Advantage of this Offer" link
5. Click "Choose" under "I already have a Dell Preferred Account" if you have one, or sign up for a new one if you don't
6. Checkout, enjoy your 3% (4% at EPP) savings