Where can I buy corn kernel for making popcorn? I want to home make popcorn by myself. Watching some video on youtube, I saw they are using a kind of kernel of corn. Are they different to what we eat normal corn? It seems that they are much smaller.
Yes is different from normal corn.  Gets hot with oil and small water inside makes corn pop.

http://global.rakuten.com/en/store/caramelcafe/item/p_cot1002food005/

Cost is ¥2,056 for 8 pound/3.63 Kilogram.  Will last very long time.

再见

[Please do not edit for clarity]