For Prime members only, Amazon offers a Optimum Nutrition and BSN Sample Box bundled with a $7.99 Amazon Credit for $7.99 with free shipping. (The credit must be used towards purchases of Optimum Nutrition and BSN products.) Assuming you'll use the credit, that makes the sample box essentially free. It includes 10 sample size products. It's limited to one box per customer.
Walmart offers the CoverGirl Ready, Set Gorgeous Foundation 1-oz. Tube in nine seven shades for $3.27. (Amazon has a few shades for the same price.) Opt for in-store pickup to avoid the $5.99 shipping fee. That's the lowest price we could find by $3. It's oil-free and designed not to clog your pores.