While it would make sense for supermarkets to provide only free food samples in their stores, there are other products which could be sampled in the same way.
1. Antibacterial products- People are more and more aware of the germs which exist in the world. Customers who are pushing carts through a store may appreciate a sample of an antibacterial product (lotion, gel, or spray).
2. During the cold and flu season, a company could sample tissues.
3. Again during the cold and flu season, a company could sample cough drops or lozenges.
4. During the summer season, providing customers with samples of sunscreen may be beneficial (especially during the week preceding holiday weekends).