From Amazon purchases, @12Oaks, sure. But not the one-cent purchases, which are books placed by individual Amazon Marketplace vendors. Each of them will charge for shipping, which does not come under Amazon’s policy of free shipping for purchases over $25.
As an occasional vendor myself, I know that Amazon is going to take a big cut of the private vendors’ sales, sometimes equal to the whole postage allowance they give. If you pay 10 cents for the envelope you put it in, you lose money. Large envelopes cost me 33 cents each.
I asked another flutherite once how people can afford to make those one-cent sales, and she surmised (from her own experience as a vendor) that they are finagling free shipping in their workplaces: basically stealing shipping services from their employers. Their whole profit is in the difference between the shipping allowance they get from Amazon and what Amazon takes back as its cut.