Think the boat you are refering to is the one that does Puerto Mont to Puerto Natales or vice versa. The company that run it is called Navimag. Used this boat in 2000.
Cost depends on type of accommodation selected - backpacker dorm rooms are the cheapest, but I recall still cost a couple of hundred bucks (all meals included for the trip). Bike costs extra - think about 50 bucks.
Rather than the boat why not ride the Carreterra Austral / Ruta 40 instead. The boat is great but the ride is much better!
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