Yeah, Casascius to me are really the only items that come to mind when people say "physical Bitcoin". They don't actually exist but Casascius have been used to represent the physical image of Bitcoin, even today by most of the mainstream media. There are plenty of other types of coins, but they're all collectibles and only have value within collector circles, as you can imagine. Just have a wade into the Collectible section of this forum: https://bitcointalk.org/index.php?board=217.0

You'll always find Casascius and others there, you'll be surprised by the quality of workmanship on these things. All the physical crypto coins I own (none are Bitcoin unfortunately) have come sellers or distributors from this forum.