The PSN section of Amazon just shows up as blank.
It's pretty reasonable to be wary of handing your credit card number over to Sony these days. They haven't exactly done a great job of protecting their data and no one wants their card getting in the hands of those who might use it maliciously. Well, it's assumed that no one does anyway.
The workaround is, of course, to buy PSN game vouchers and point cards from other sources. One of the best sources has been Amazon, since they allow the quickest possible access to your new titles. However, visiting the PSN page of Amazon reveals that this source has been cut off.
"We have no announcements regarding this change in selection," says an Amazon PR rep, "however we can confirm that Amazon Digital Video Game Downloads is not currently offering Playstation Network Online Game Codes and Points Cards."
Source: PSN Stores