Wow I didn't realise the Japanese are getting just as badly ram-roded as us in the UK. The minimum price on their retail games being 4800 yen which roughly translates to £35, and that is what we get charged here as well. The US $40 retail seems to be the cheapest.
I do agree with the OP, 3DS games should really be between £20-£25. Going into £30 and above is home console territory, which should be off-limits to handheld games.










