Cell Phone Idea:
At the end of each semester, students who bought spanish cell phones give them to IES if they will not be bringing them back to the United States.
IES will then hold them until next semester's students come, and those students will be able to use those phones instead of buying new ones.
This helps prevent these cell phones ending up in the trash, and also helps prevent students from having to buy a cell phone once they arrive.
There could be some kind of incentive for the students to give their cell phones to IES, but I have not thought of one yet.