VMware has a promotion for 15% off
Workstation 9 (for Windows and Linux) and Fusion Pro (for Mac) until March 22, 2013, good for both new purchases and upgrades from earlier versions.
Workstation licenses are good for both the Windows and Linux host versions. Although you can use your license on only one host at a time, you can transfer it between different hosts without restriction, which makes the high cost somewhat more palatable. You can also use the free (for personal non-commercial use) VMware Player
to run stand-alone virtual machines created with Workstation on other hosts. Player can create VMs, but not clone existing ones as Workstation can.