Costco has Dell XPS One All-in-one PC [Review] for $600 with free shipping. Non-members pay an extra 5% making it $630. Thanks radejs

Specs

• Intel Core 2 Duo Processor E4500 at 2.2GHz
• 2GB Dual Channel DDR2 SDRAM at 667MHz
• 250GB Serial ATA 7200RPM Hard Drive with DataBurst Cache
• 8X DVD+/-RW
• 20" Widescreen Monitor WSXGA (1680 x 1050 resolution)
• Intel Integrated Graphics
• Integrated Gigabit Ethernet (10/100/1000Base-T)
• Internal PCI 802.11 b/g/n Wireless Network Card
• Hybrid TV Tuner (NTSC/ATSC) with remote control
• Integrated Audio
• Built-in Speakers
• Dell XPS One Wireless RF Mouse
• Dell XPS One Wireless Keyboard
• Windows Vista Home Premium
• Norton Internet Security 15 Month
• 1-Year Dell Warranty (see below)

Note, there is some inconsistency with the warranty that's included. The specifications list 1-Year warranty, however, Shipping & Terms page suggests that the PC comes with a 2-year on-site warranty