This Desktop PC

CircuitCity.com has the Acer Aspire AM3100U3300A Desktop PC With AMD Athlon 64 X2 5000+ Dual-Core 2.6GHz, 2GB DDR2, 320GB, 16x DL DVD

Buy.com has the refurbished HP Pavilion A6157C Desktop Intel Core 2 Duo 2.0GHz Desktop for $400 with free shipping. New customers can take $10 off $200.
Intel Core 2 Duo 2.0GHz, 2GB DDR2, 320GB HD, High-Definition TV Tuner
Remote control, video recorder, FM tuners, Dual-layer DVD+-RW Drive
15-in-1 reader, Windows Vista Home Premium

Product description from Buy.com:

Equipped with everything you need for a true multimedia experience, this desktop PC is ready to become the heart of your entertainment center. Armed with the Windows

CircuitCity.com has the HP Pavilion A6220N Desktop PC, Core 2 Duo 2.2GHz, 2GB DDR2, 400GB, LightScribe DL DVD

OfficeDepot.com has the Gateway Desktop Computer With AMD LIVE Technology, AMD Phenom 9500 Quad-core 2.2GHz, 3GB DDR2, 1TB, 16x DL DVD

CircuitCity.com has the HP Media Center M8200n Desktop PC With Enhanced Virus Protection, AMD Athlon 64 X2 Dual-Core 6000+ 3.0GHz, 3GB DDR2, 500GB, LightScribe DL DVD

Dell Home has the Inspiron 530 Desktop with No Monitor for a price of $499 + $30 shipping = $529 shipped. Available with XP Home or Vista Premium.
Intel Core 2 Duo 2.33GHz, 3GB DDR2, 500GB SATA, 16x DVD+-RW
Intel GMA 3100 Video, 7.1 Audio, Dell KB/Mouse, XP Home Edition

Dell Home has the Dell Inspiron 530 Desktop, Intel Pentium Dual Core 1.80GHz, 1GB DDR2, 250GB, 16x DL DVD

Dell Small Business has the Dell Precision T3400 375W Desktop,Intel Core 2 Duo 1.80GHz, 1GB DDR2, 80GB, CD-RW/DVD-ROM Combo, Vista Business , 256MB NVidia Graphics Card, 19” E198FP Widescreen Flat Panel Analog Monitor, 3-Year Warranty $869.00 Shipped
Product link.

Dell Small Business has the Dell Vostro 400 Mini Tower, Intel Core 2 Duo 2.66GHz, 2GB DDR2, 250GB, 16x DVD

Dell Small Business has new coupons on Dell Vostro Desktops. Free shipping $399+. 35% off any Vostro Desktop over $1000 code HP?D0GM5R$6SDB$400 off any Vostro Desktop over $1099 code RK$583VW110502