You can get orange or mango butter anywhere that sells these types of products. I know I've gotten some from Amazon but there are many other places. They are made from oranges/ mangoes. Lovely products!
My favorite part is when you whip it. So much fun to make! Just be sure that you let the mixture get opaque in the fridge before you get out your mixer.
Arrowroot powder is to make it less greasy. I don't always use it- it's optional. As I said "a little body butter goes a long way". My sister is addicted to these butters and she's super picky about such things. I use different essential oils depending on my mood.
The last batch I used lemon and grapefruit essential oils and we loved it.