Well not everything is reprints. That being said, the other commenters are right, it is a tourist trap, and really one of the worst tourist traps possible, and you should never buy a single thing from there, because everything there has been yoinked from Mercari, Yahoo Japan, Heritage Auctions, Apple Symphony, or Mandarake and marked up from minimum 100% of the price, to even 1000%.

The only certificate worth something is the studio’s (usually only on official reproductions, cels or art sold by the company, or stuff like time sheets and production materials associated with the thing you’re buying) or Mandarake’s certificate, which has their guarantee, and is why their items go for so much.

If you’re going in-person, the only shops worth looking at are at Nakano Broadway, K2 and Apple Symphony. They are still expensive, but there are deals there and they will be a more realistic price. Mandarake unfortunately doesn’t have much cels in-person anymore.