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HP.com has the HP Pavilion a6460t Core 2 Quad processor Q9300 2GB DDR2 500GB SATA desktop PC for $599.99 with free shipping.
How To Get It:
1. click the "Customize & Buy" button
2. choose "Intel(R) Core(TM) 2 Quad processor Q9300" [+$280.00]
3. choose "256MB NVIDIA GeForce 8400GS and TV Tuner Card/PVR" [+$70.00]
4. apply $400 off $999 coupon code "DT9632"
Final Price for this deal: $999.99 - $400 = $599.99 + Free Shipping

Description:
* Genuine Windows Vista Home Premium with Service Pack 1 (32-bit)
* Intel(R) Core(TM) 2 Quad processor Q9300
* 2GB DDR2-800MHz dual channel SDRAM (2x1024)
* 256MB NVIDIA GeForce 8400GS and TV Tuner Card/PVR
* No Modem
* FREE UPGRADE to 500GB 7200 rpm SATA 3Gb/s hard drive from 320GB
* LightScribe 16X max. DVD+/-R/RW SuperMulti drive
* 15-in-1 memory card reader, 1394, 2 USB, audio
* Integrated 7.1 channel sound w/front audio ports
* No additional security software
* Microsoft(R) Works 9.0
* HP keyboard and HP optical mouse