This deal has ended.
Updated. AT&T has this Apple 64GB iPad with Wi-Fi + 3G for $529 with free shipping when you sign up for a 1 month 200MB data plan (which is $15). You can cancel the plan after a month. This is the best price we could find by $150.
You can also get the 16GB 3G Model for $429. These 1st generation ipads serve as a great eReader, portable web browser, and much more. Sales tax is charged in most states.