You can get a 30 day free trial of the latest release (v9) at http://www.vmware.com/products/workstation/overview.html
This will be great for v5.0 or 5.1.
If you want to buy it, there is a promo going on until March 22:
http://store.vmware.com/store/vmware/en_US/DisplayProductDetailsPage/productID.221027300?src=email_eBIZ_EmailBlast_Workstation9_MarchMadness_Buy_031913_US