Newegg.com has the Lenovo IdeaPad Z580 15.6" Desktop Replacement Laptop for $529.99 with Free Shipping.

Design – Optimal Use

This is a mid-level laptop with a good balance of power and portability. It weighs 5.8lbs and has a larger 15.6" screen, so it's probably not for "on the go" types. However, it has more than average amount of memory and a 3rd generation Intel CPU with enough power to handle pretty much all home or small office tasks like browsing, email, office applications, etc. Gamers however should look for a purpose-built notebook with a faster processor and discrete graphics chip.

Key Attributes

Rated for 5 hr battery life, you’ll probably get a little less
LED-backlit screen helps reduce power usage
Current generation Intel processor for good performance
Plays and burns DVDs, CDs
Windows 7
1 year warranty

Specifications:

• 3rd generation Intel Core i5-3210M processor up to 3.1Ghz
• 6GB RAM 750GB HD
• Widescreen 15.6" HD Display 1366×768
• Intel wireless display capable, HDMI
• DVD Writer
• Bluetooth and 802.11N Wireless
• USB 3.0 ports