>>14338657
Depends. On AmiAmi, they can go for around 3,500 JPY, which is like, about 30 obamas. However, those ones are from a trustworthy source that most likely buys in bulk from gift. We'll call these stores that seem to get their fumos from gift in bulk "proxies".
Fumos are a bit like action figures; they're only produced in finite quantities. People on Amazon and other such sites that aren't gift or proxies, they're resellers that happened to snag one. The reason that the resellers sell them for the prices that they do is for 3 reasons:
1) As said before, they're only produced in finite quantities, which makes them valuable and highly collectible.
2) The people buying them are otaku enthusiasts who typically have disposable income and are willing to spend much more than most people would on this sort of thing.
3) (does not apply to all resellers) Because many resellers are selling fumos in an international market, they charge more money for their product. The amount of money they charge for the product is far above and beyond the costs of operating internationally in order to sell said product; long story short, they sell the fumos for that price because they can, since their buyers are baka gaijin piggu.
So what's the lesson to be learned here? Buy your fumos from gift or a proxy of gift! You're guaranteed not to get a bootleg, and you'll get it at the best price you'll ever see it at.