This could actually be an ongoing mission of your group if you wanted. Teach the youth how to make rosaries and then send them to places where they are most needed. You could spend a meeting teaching them how to make them and have the members make them on their own time. Set a goal to send away a certain number of rosaries for the year.
Our Lady Rosary Makers International actually prices and encourages this sort of mission and is a great place to get cheaper supplies and to find a list of where to send the rosaries when you are done with them.