Where can I find purin cups?

Hi all, I've been searching and been asking around. No one really knows the answer. Does anyone know where to find purin cups?

They look like this:

http://chowtimes.com/wp-content/uploads/2011/03/Japanese-Purin-2.jpg

http://chowtimes.com/wp-content/uploads/2011/03/Japanese-Purin-4.jpg

If you know the manufacturer's name, that would be great!

Thanks!

Do you realize that those can be used only once? Those are the cups/molds for making "pucchin purin," meaning the one you make, then when you serve it, you turn the cup over and break the little protrusion on the bottom to let air come in (thus the pudding slides out of the cup), so it's for one-time use only.

I found it online:
http://www.cuoca.com/item/30279.html#review

This "Cuoca" seems to have shop locations too:

http://shop.cuoca.com/

I don't know where you are, but from the top, the shops mentioned are:
Jiyugaoka, Nihonbashi Mitsukoshi Dept. Store, Kijichoji, and Takamatsu (on Shikoku Island).

Whoops, English shop directory too:
http://shop.cuoca.com/english/