The one you show is of the Proof Clad version. There are actually around 7 - 8 versions with minor variations. Depending on the variation they can demand around the $20 - $25 area. Other than the .999 silver version which can be in the $40 to $80 area depending on a bid war on eBay. I paid $58 for mine a couple years ago and have only seen 2 since then that were .999 silver.

Below is the .999 silver version.