That is one of the ways, this is how to buy it: go to the shrine in Hateno village, at the shrine look for a house that's on the other side of a bridge, there will be 3 people at the house talk to the one with a pink headband (the boss) once you buy the house get all of the upgredes... talk to the one with strange hair and then he will go to Lake Akkala, Talk th him again in his town and help --->