Hard call, but from days when I was running in engin' country we all carried a 1oz gold bar. buy you across a border pdq.
You'll want a folded Benjamin in your B-o-B, in your wallet, and a couple more, like in your "A" bag, at your hide site...buried with your shotgun and ammo., say $400-$500 total
In your safe, the more the better. Silver ounces are perfect. Silver coins as in US and pre 1965 are G-t-G as well. And for the long term part of your survival portfolio, a pound or two of the yellow stuff, mostly in 1 oz. bars or coins but some in 1/10th oz. mini coins
Don't forget to place old rings, jewelry, gold teeth and stuff like that in there as well. I put a hostess Twinkie in there as well!