Very easy indeed.
You can buy 1oz Koala coins on-line at the Perth Mint for $39.50 bought 3 yesterday.
Register here, then go shopping.
https://www.perthmint.com.au/members/register.aspx
Koala
http://www.perthmint.com.au/catalogue/2011-australian-koala-1oz-silver-coin.aspx.aspx
