For Prime members only, Amazon offers a selection of sample boxes, each bundled with a category-specific Amazon credit, for $4.99 to $9.99 each, as listed below. (The credit will be applied to your Amazon account one week after your items ship.) Plus, all orders receive free shipping. Assuming you'll use the credit, that's like getting each sample box for free. The deals: Update: These items may now take up to two weeks to ship.