MacMall.com has the Mac Pro 4-Core Workstation (model no.Z0D8-3GHZ) on sale for $2849. It is normally priced at $3049 and includes FREE shipping (cost covered up to $40) with this mail in rebate from UPS. Sales tax is applicable in California, Tennessee and Wisconsin.

The Mac Pro 4-Core workstation has two Dual-Core 3.0GHz Intel Xeon processors, 1GB RAM, NVIDIA GeForce 7300 with 256MB memory, 250GB hard drive, 16x double-layer SuperDrive and OS X 10.5 Leopard. Also included is a Mac keyboard, Mighty Mouse and Apple's standard one year warranty on parts and labor. Dimensions: height 20.1in., width 8.1in., depth 18.7in., weight: 42.2lbs.