the only difficulty with this, if you have the money to spare, is the fact that Nintendo doesn't trade in the US. you need to find a place that deals with Tokyo's stock exchange. i think the main way to do that would be to find a brokerage that has Forex trading and going from there, but before you go that far you might wanna get your hands a bit wet first with the stuff in the US market since some might have minimum balances required. unless you've got a couple thousand, in which case, go call a few of the guys with Forex up and see what there is.
a lot of trading can be done by you on your own through a bunch of trading places. TradeKing i don't think has Forex, but Zecco does. those two are likely the cheapest you'll find in terms of commission per trade. etrade and scotttrade are the bigger and better known ones and i'm pretty sure the former also can trade internationally too. it's not that hard to get an account so long as you've a bank account, some money in said bank account, and can fill out a few forms.
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The future must protect the clone's past.
"Maybe it's a tentacle, molesting the planet itself. - Aschen Brodel.