My personal experience is that calling D* and asking the best they can do is better than the website.
Plasma Concepts is good too.
If you have AAA there is a great deal through them, and don't forget to get a $50 referral from a friend or here if you don't have one (sticky in main area).
The AAA offer is generally $10 off for many months on top of the current promo that is already around $18 off.