Pacific Northwest Tree Octopus Pathtag, sent to me by Shop99er and TTUMS. What's a Pathtag? you ask...
Pathtags are personal trading items. Used most often in Geocaching, they are also very handy for Scouting, Military and Promotional use. ... Pathtags are not typically traveling items such as Geocoins or Travel Bugs. They are generally used as personal "signature items" for Geocaching or other trade item. If found, simply log it and the tag's profile will display for you to view. Unless the profile says otherwise, you are welcome to add it into your permanent collection.
You can find more info on the Pathtags site. They're about the size of a US quarter and the reverse has a unique ID number that you can enter into the site to log it and tell the maker where or how you found it.
The Tree Octopus ones are not for sale. If you want one, you'll either have to find it in a Geocache or trade with someone who has one (like Shop99er and TTUMS on the Pathtags site, who had them made with my permission).