Super Famicom prices have been slowly rising, they used to be dirty cheap but now that yen is at an almost historic low foreigners are sucking everything from the shelves.
Shopping there right now is a fucking killing spree for the adult-child. They should probably raise the prices on some of the vintage stuff in the high traffic areas. Some places like mandrake will keep the really nice stuff on display with prices more like you see on eBay.
But buying new stuff with that exchange rate is good getting now, too. Funny, between the exchange rate and the rolled-in shipping, the thing I really have to sweep for there are Tamiya rc kits. Funny like ironic because those motherfuckers are not small. I have to flatten the boxes and cram all their little guts mixed up in a luggage. Throw away the wheels and tires lol. I did a death stranding haul with two of these sum bitches tied to a backpack full of old games with paracord. I really should have got a taxi.
Interestingly, a gpu will be conveniently adjusted to stretch a dollar exactly as far as it does in the US.
For vintage game shopping, depends on what you are looking for and why. Example- I got a neo geo pocket cheap enough, but after I upgraded the screen, I could have got one already done off eBay for a little more. But it wouldn't have been a souvenir from a great trip. I wouldn't buy tokimeki memorial from eBay, but when I saw one with the pretty embossed cover while just flipping through the shelves, it was a no brainer. Getting Saturn pads was just cheap and convenient be cause those 8bit do ones are trash and both broke on me. They're pretty small.
Idk maybe you think you are going to go make some yard sale find on a rare game then... Yeah no.
All that said, I'm not sure about the economics of taking trips to Japan to buy games to scalp. Some of these shops do list games on eBay. The games are getting older, the people who want them have more money, I don't think you need abusive scalping to explain this.