That museum seems more like a store to me. I can't read kanji, but considering how many things had prices on them it seems that only a few things are part of the "museum" and the rest is just merchandise.
Either way, it's still awesome. Too bad we don't get stuff like that here in North America.
Well, it's IN a store (Gamers) so... lol
I did actually go to it! It is like 70% store and 30% museum. Picture time~~

Happy Birthday Yayoi display on the 26th at Kotobukiya! I drew something for it and stuck it up on the board too! (and quickly took a picture of the general area with it:
click~, can you find mine?

)
Here's the pictures I took at the Puchimas museum:
Post #1,
Post #2, and
Post #3! Also, my imas goodies from the trip:
one more link~.
I also did pokemon, TWEWY, and disney related stuff that day. I went to shibuya, saw Sugar Rush (Wreck-It Ralph), and yet another pokecen trip (i had to get my event pokemon gosh darnit). Spent a lot of time in the Club Sega arcade playing Project Diva Arcade too. It's too fun, I wish there was a machine back home I could play ;w;