When I was researching this a couple of years ago, I found the prices to be fairly similar across the sellers. They all start with the same fixed JPY price, but their prices differ based on when they convert the JPY amount to USD and how often they update this (e.g. some do it weekly). Since the USD to JPY forex rates have been fairly flat lately, I would think the pricing would have been similar. However, some may tack on an opaque fee, so it is worth doing a little research.