[Kozak]

You could buy smaller denominations (1/10 0z, 1/4 etc). You could exchange larger for smaller coins, you could exchange it for silver. I have all of the above.

[agere_contra]

There will be a market for "money changers" - e.g. people who will issue 1 gram bits of gold bullion, or even (if there's enough trust in the issuing organisation) de facto Gold-backed certificates becoming a currency.

[kevao]

You could buy smaller denominations (1/10 0z, 1/4 etc).

Do most metropolitan areas have reputable dealers you can buy from locally? I don't like the mail-order idea.