Groupon has the Toshiba P775-S7100 for $425 with FREE shipping right now. This unit is manufacturer-refurbished, and the specs are impressive! It has an Intel Core i5-2450M processor, 6 GB of DDR3 RAM, a 750 GB hard drive and Windows 7. This same exact laptop is over $750 brand new on Amazon right now.
Not sure what you need in a new computer? Read this first: Buying a new computer? Get the most bang for your buck!