The gold American Eagle coin comes as small as the $5, 1/10 ounce coin. Other countries mint even smaller, so it is a nice size in comparison. The other sizes it comes is the 1/4 ounce. the 1/2 ounce, aand the one ounce.
One innovation that came about a few years ago is the high relief gold American Eagle. However, if you are obtaining gold as bullion the high relief may have too much of a mark up.
The denominations on the larger coins is $10 fo the 1/4 ounce coin, $25 for the 1/2 ounce coin, and $50 for the one ounce coins.
All four coins have been minted as proof coins for numismatists, thse who collect coins. Proof coins are no really bullion, but are numismatic coins.