Deal copied from FatWallet.com - Originally posted Oct. '10, but supposedly still works.

This is on top of the current Directv package savings.
This is the best deal I have found for new Directv customers. Will only work if you are a new customer, and requires a 2 year commitment.
Follow the instructions below to save $280 on top of the current Directv package savings.

Go to the Costco website here:
http://shop.costco.com/Feature/DIRECTV

Costco Directv offer
Click the button that says "residential customers click here"
Then after that page comes up, click on any of the orange buttons that says "Learn more"
That brings up the cart page where you select the package and equipment that you want. This will also allow you to see what you payments will be for the next 2 years.
Now that you are on the cart page, paste this link in your address bar: http://www.directv.com/refer
Type in an account number from a friend or another source and click "get directv now".
That will bring you back to the cart page, and should show your first 10 months are $10 lower.
Make sure that a Costco banner is displayed at the top of the page, if it isnt, you will not get the $180 Costco cash card.
Continue checkout as normal.
Print copies of everything as proof.
Done

Note: I did not get a confirmation about the $180 Costco cash card, it was Fedex'd to me 3 weeks after the install date

Another note: Avoid signing up by phone, do everything online. I tried to do this by phone initially and they messed up everything from not giving me the $100 referral discount, spelling my name wrong, and entering the wrong email address. It was so bad that I had to cancel and re-order online.