Amazon video games has posted that they have now sold out of both consoles.
Heres's a quote from Amazon:
"After a crazy and exciting month, we’ve sold through our initial allocations of PS4 and Xbox One. Thank you to all who have ordered and shared your opinions. We have the Standard Editions for both consoles still available, but we can’t guarantee these at release. Please check back here as we’ll update you first if we receive further release day allocations."