This week's app is Air Mule. Think of it as Uber for package shipping, as travelers use their spare luggage space to shop items. $40 for up to 5 pounds. If you have extra space in your luggage, you can rent it to people needing something shipped. Packages can be delivered internationally within 24-72 hours.
Website: Vaccine.org. Find out where to get a flu shot near you. Usually a local pharmacy.