Some rare Casascius coins have sold for more than X their loaded value. The limited size of the industry is a problem, as a number of firms have already gone out of business, while others never even started shipping their products. I find it curious that this has been down voted since it is, in fact, the answer and history pertaining to this post. Physical bitcoins have been around for years, but they are anything but mainstream and there are very few companies involved in this fledgling industry. It is difficult or impossible to read the private key on the coin without damaging or destroying the hologram, which exposes a honeycomb-like tamper-evidence pattern when peeled.
humtiopue 