Have you checked out "Beyond Your Backdoor"? It's a nature store and a new division of Lesser Jewellers.
This magnetic nano geocache container stays put! With a strong magnet and two waterproof log sheets, this is ready to be one of your sneakiest hides!
These are perfect for your local urban Geocaching experience. It measures a tiny 1cm by 1.5cm! With an anodized coating and magnet in the bottom, this is the perfect hard-to-find nano cache.