Oh, this is really niche but if you are into tattoos at all then look up artists and get one done there. On our first trip my wife looked up an artist in Osaka ahead of time and booked in for a tattoo. It looks great and she ended up paying ~$250 for something that would have probably cost $600-1000 in the US. It's a back tattoo that extends from the base of her neck to the middle of her back (so maybe 8-10 inches?). I've never had a tattoo myself so I'm kinda guesstimating but she said it would have been a ton more expensive here and I have friends who have full sleeves done for like $5-10k so I can imagine