Puerto Montt is nice. I came here on a ship. Fantastic handicraft market near the port. Picked up a pure white alpaca rug for $95US (6ft x4ft). Scarves (alpaca) $3-$6.
I posted stuff from the post office here Everything sent from Chile goes airmail but the price is VERY REASONABLE. Everything got home. There is a very good money wire place, down on the front street, (near the post office, but the PO is in one of the streets behind the front street) and you can change money into Chilean Pesos for a decent rate of exchange.
It is also the gateway to Puerto Varas (you may want to stay here instead, on the lake, reasonably priced restaurants and a casino), Osorno Volcano and Petrohue Falls. You can get a chairlift up the volcano from the ski centre. Cheap. Taxi from Puerto Montt to Puerto Varas was $40, but oyu can get it cheaper than that. We worked on the ship and $10 return each is good enough for us.