Exclusively for Prime members, Amazon offers the Purina Cat Food Sample Box bundled with a $6.99 Amazon Credit for $6.99 with free shipping. (The credit must be used towards purchases of select Purina cat products.) That's tied with our mention from three weeks ago, and assuming you'll use the credit, makes the sample box essentially free. Each box contains six or more samples of dry and wet cat food.

Note: It's expected to ship in one to two weeks.