Where to buy lumber and metal pipes in Kanazawa or Japan in general?

I'm looking to build something like a 4 post bed frame from either 4×4 wood posts, 1.5" metal pipes, or both. I can find all the fittings I need on Amazon, but I've been searching around to find the lumber and metal pipes and I'm yet to crack the code on what to search for to find them. Do you have any recommendations for specific shops in Kanazawa where I could find these things? or just some hints for what to search for to find such shops in Japan?