If it were me I wouldn't start the cleanse with only grade A on hand.
It has much less minerals than the recommended grade B.
You could become deficient in nutrient absorption due to the fact that your body will only absorb nutrients to the degree that minerals are present.
Here is a link graciously offered by Zoe --
At the bottom of the page it tells you how you can get free shipping on an order of $50. or more.
I get three at a time - no shipping costs.