Does anyone know where I can buy large amounts of Epsom Salt (Magnesium Sulfate). Back in Australia, Epsom salt is available from most supermarkets for approximately $4 per 1kg.

In case you are wondering, I am using it in a bath to relieve aches and pains. It is cheap and very effective.

For those who are interested:

Magnesium: a powerful vasodilator required for proper muscle function, as well as neuromuscular coordination. It prevents the muscles from going into spasm resulting from strenuous activity.
Sulphate: improves elimination & detoxification from the increased metabolic waste resulting from physical activity, and therefore improves recovery time.
Together they also combat inflammation which occurs in the body all the time, but at a greater rate after strenuous exercise.

How to use it:
For general maintenance to prevent muscle stiffness and improve recovery time, use 3-4 cups in a bath once or twice a week. Gently kneed your tight muscles while in the bath.