In the event of the apocalypse I think cheap cookware will be more valuable than gold. Consider all the things you can do with a pot post-apocalypse:

* Cook in it, clearly

* Use it as a shovel

* Sit on it

* Drink out of it, or eat out of it

* Use it as a toilet (might want two pots)

* Use it to collect fruits and berries you gather

* Use it to collect rainwater

* Conk people/animals/zombies over the head with it

* Sharpen the lip by rubbing it against some rocks and use it as a knife

* Use it as a helmet during the radioactive hailstorms

That's just what I've come up with in a few minutes of thinking. Other than conking you can't do any of the above with a gold brick.

Perhaps the ordering procedure can be performed by plain old TCP/IP-over-pigeon: https://www.ietf.org/rfc/rfc1149.txt

Post apocalypse I think we're going to be down to mail-order rather than that we'll use the internet, unless those carrier pigeons will be used to implement tcp/ip as well. I'm half tempted to figure out what the amount of gold is that a carrier pigeon could carry. Storing $10M in cash would guard against a short duration (3 months?) collapse of the banking system, storing it in gold is to guard against something of a completely different order.