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About a year ago PSN Digital Codes vanished from Amazon.com without much of an explanation. You used to be able to purchase PSN cards as well as game codes for PSN games directly through Amazon.
That option will be returning as the “Amazon Video Gamer” account stated over on NeoGAF:
Anyone else here excited about PSN digital codes coming back to Amazon?
Cheers,
Tony
You can now purchase PSN digital codes for $20, $50 and a subscription to PlayStation Plus (3 months or 1 year).
~ Source