Is that a US presidential dollar coin (issued 2007 to 2014)?

It looks like the Lincoln dollar

We hardly ever see dollar coins here in the US. Are they widely available there?

Presidential dollars and Sacajawea dollars were frequently described as "gold" or "golden" here but they're just brass (metal value about 6.4c)

If you're open to saving metal disks, actual gold & silver are attractive, but I think the US nickel is also worth considering. Metal value is already over 5c and as a solid alloy (unlike pennies, quarters and dimes) it should have much better barter-ability than token coinage (for example because they can be weighed to give an accurate estimate of value regardless of wear)