That's where AT&T's recent promotion comes to mind as the number two carrier in the country is offering a delightful deal for those who purchase their phones through their web site. Right now, they're dishing up a $100 discount on select phones which include recent additions like the HTC Surround and Samsung Focus.
Although not every single device will be offered with the $100 discount, you'll just need to read the fine print to get yourself the full bounty. Specifically, you'll need to activate the handset on a qualified rate plan of $39.99 or more with a 2-year contract.
Naturally, items like netbooks, Go-phones, and the venerable iPhone are excluded from this promotion, but you'd better think fast because there is no indication when it'll expire. Finally, you'll receive two-day Priority Shipping with your timely order.
source: AT&T via WPCentral