The easiest way to get the direct plug (which Apple bizarrely calls a "duckhead") is to buy the World Travel Adapter Kit, which includes all the duckheads they make, including one each of the U.S. and Chinese plugs, both of which will work in a U.S. outlet.
That's the easiest way. The cheapest way is probably to ask someone -- a lot of people don't use them and might be willing to part with it for cheap/free. (Especially people who bought the World adapter kit, since it replicates the one they already have!)
As for the cord: have an Apple service provider order it as a service part. It shouldn't be terribly expensive, if Apple's power cord prices for previous models are any indication (probably about $10, plus the service provider's markup).
tooki