For Prime members only, Amazon again offers a selection of beauty sample boxes bundled with 100% back in Amazon Credit from $9.99 with free shipping, as listed below. (The credit must be used towards purchases of similar beauty products.) Assuming you'll use the credit, that's tied with our mention from last week, making each box essentially free. The deals: Note that this offer is limited to one box per account, which may carry over from our mention from last week.