You don't work for Amazon, do you?
I have actually pondered over the idea of listing online retailers - probably in the links section. Specialist places such as Sister Ray, MNS and Townsend deserve more of a mention that Amazon or HMV in my opinion.
That said, John's music is much easier to get hold of nowadays, than it was when I first got into it, when it seemed quite rare and obscure. Of course people are capable of making their own choices – I guess that link just acts as a starting point.
Anyway, the link is not a permenant fixture. I thought that the two 'tour' CDs being sold on there was a good enough reason to include it at this present time.