Silly question

I am currently studying in Japan for a semester, and have to cook for myself. I am currently living in Yokohama, and my question is where can I find chili? More specifically, bird's eye chilis. I saw them when I was in the Chinatown here, but figured I would be able to find them in my area. Oddly, I can't. Is it just uncommon? My Japanese is not the greatest, so I decided I'd rather ask on the forum than try to ask shopkeepers.