With only two or three available dates, these fares to Brazil are extremely scarce, but too good to let go without a mention. From Miami to Manaus, $392 round-trip, including all taxes on American?! That's amazing stuff!
June departures also available from New York for $514, and Baltimore for $587, with similarly priced fares from other cities. For the complete list (so far!), see our fare page for Manaus, Brazil. These probably won't last for long, so pounce fast!