Does anyone remember the single shot shotguns that were made to look like a cane? I want one.

1- Where can I find one? I've searched high and low and haven't succeeded yet. I'd prefer a smaller shotgun, like perhaps a 28 guage.

2- What do I need to do as far as the goons -- er, ATF agents are concerned? I'm told it's classified as an "any other weapon," but I don't know what to do to buy one legally.

Please help out!