Hi!
I can't answer all of your questions, but I've found coconut oil in the cooking sections of grocery stores and the beauty/health sections of health-food stores! I use it cold on my damp or dry hair.
This article is useful:
http://forums.longhaircommunity.com/...e&articleid=71
Here is a list of reviews!
http://reviews.longhaircommunity.com/showcat.php/cat/6
I've not tried castor oil.
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