For some reason Amazon have withdrawn all PSN items from sale. This seems to be the case for both Amazon.com and Amazon.co.uk.
This applies to all types of content that was on Amazon, from PSN cards and the US’s digital game downloads. Currently, on the UK site PSN cards are either listed with other sellers or show that they are unavailable.
PSNStores questioned the removal with Amazon who issued a statement: “We have no announcements regarding this change in selection, however we can confirm that Amazon Digital Video Game Downloads is not currently offering Playstation Network Online Game Codes and Points Card”.
Currently, there has been no word from Sony about the issue.