It will have lots of names across the sub-continent, in different languages. Javantri is one.
Mace powder in Hindi is called "Javitri".
You can get henna powder at any Indian grocery store. Look up in the net for the local Indian groceries near your area.
You can buy Turmeric Powder at most grocery stores in the spice section, usually it's just called 'turmeric'. However, you can usually get a much better price at an Indian grocery store, since it is used a lot in Indian cooking.
To substitute allspice powder for a blade of mace, use about 1/2 teaspoon of allspice for each blade of mace. Allspice has a similar warm and aromatic flavor profile, making it a suitable alternative. However, adjust to taste as the intensity can vary.
I have been in the USA since 2010. I am Indian and I love Indian sweets but frankly speaking, I am not cooking at home. I miss it whenever the festival came. So, I just order it from "Kesar Grocery" every time and enjoy Indian delicacies with deliciousness. Kesar Grocery is one of the oldest online Indian grocery stores in the USA.
Sandalwood powder can be purchased at health food stores, online retailers, or specialty stores that sell herbs and natural products. It is also available at some Indian grocery stores or beauty supply stores.
You can buy cocoa powder at your local grocery store in te baking section.
you find them most at grocery's stores.
No, it is not expensive at any grocery store.
There are about 450 Languages spoken in India and about 700 different Native American languages. But there is no such language as "Indian".
At any Supermarket or Your local grocery store
Arrowroot powder is available in grocery stores in the spice aisle or on-line at gourmet shops. Try Amazon.