It's interesting how Vodafone say it's “exclusive” - especially when they say the Green Nokia N8 is also “exclusive” to Vodafone… even though you can easily buy it from www.nokia.co.uk … not exactly exclusive is it?

The entry on Amazon has been removed by now, the link you posted leads to a 404, hmm…

two points:

1.
http://www.expansys.com/htc-7-trophy-windows-phone-7-uk-204880/
exclusive as far as operators go then, but not “available exclusively from”

2.
Sim Free Galaxy S from Expansys - £439.99
Unlocked PAYG Galaxy S from O2 instore - £319.99

so, exclusive means as far as UK operators, and always has. And expecting sim-free phones to be cheaper than payg's is not always the case