It should be noted that there's a lot of hammers in the game. There's several at the Mortician's in Cyseal, there's one at the Harbor when you first enter Cyseal (on a bench), there's at least one at the blacksmith's in Silverglen, etc, etc. They're pretty common, so if someone needs one, don't worry about it and just keep your eyes open and you'll find one before long.