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Bestbuy.com has the Acer Aspire Q6600 Desktop (Intel Core2 Quad Core, 2GB RAM, 500GB HD) for $549.99 + Shipping.
Original price was $709.99.
Final Price for this deal: $549.99 + Shipping

Description:
* Intel® Core™2 Quad desktop processor Q6600 with 4 processing cores, 2MB L2 cache and 2.4GHz processor speed per core
* 2GB DDR2 memory for multitasking power, expandable to 4GB
* SuperMulti DVD±RW/CD-RW drive with double-layer support records up to 8.5GB of data or 4 hours of video using compatible DVD+R DL and DVD-R DL media; also supports DVD-RAM
* The Intel® Core™2 Quad processor delivers 4 complete execution cores in 1 processor for better multitasking and multithreaded performance; Intel® Smart Memory Access optimizes data bandwidth to accelerate and improve instruction throughput
* Intel® Advanced Digital Media Boost accelerates the execution of Streaming SIMD Extension (SSE) instructions to significantly improve the Media Boost performance on a broad range of applications, including video, audio, image and photo processing
* 500GB Serial ATA hard drive (7200 rpm)
* ATI RADEON HD 2400 discrete graphics with 128MB video memory; up to 384MB total available memory as allocated by Windows Vista; high-definition audio (8-speaker support); 1 DVI output
* Multiformat media reader supports CompactFlash Type I/II, Secure Digital, SmartMedia, Memory Stick, Memory Stick PRO, Microdrive and xD-Picture Card
* IEEE 1394 (FireWire) interface and 6 high-speed USB 2.0 ports, front and rear accessible, for fast digital data transfer and easy peripheral connectivity
* Built-in 10/100/1000 Gigabit Ethernet networking interface with RJ-45 connector
* Includes keyboard, wheel mouse and 2 USB speakers
* Microsoft Windows Vista Home Premium Edition operating system preinstalled; software package included with Adobe Reader 7.0, Microsoft Works 8.5, NTI CD-Maker Gold and more