Vista Home Basic 32bit = £55.48
Vista Home Basic 64bit = £55.48
Vista Home Premium 32bit = £72.98
Vista Home Premium 64bit = £73.98
Vista Business 32bit = £91.48
Vista Business 64bit = £91.98
Vista Ultimate 32bit = £122.48
Vista Ultimate 64bit = £126.86
OEM software is designed for system developers but you can pick up these discounted editions over at Amazon. They are fully featured legitimate softwares.
Conditions of OEM purchase include installing the license on only one machine, and the item is sent outside of retail boxing and without any manuals or merchandising that you would expect to find in a fully boxed, more expensive, commercial shelf edition.
All versions eligible for FREE 'Super Saver Delivery' through Amazon.