We do not have enough calculators to do this. Instead, we give each teacher a class set (or almost a class set) of calculators. They are handed out in the beginning of class (if needed) and collected again before the end of class. Depending on the student population and on the teacher's procedures, we do lose some calculators this way every year. I almost think we would lose fewer if we signed them out to students for the year, but alas t hat is not an option for us.
For the last several years, we have assigned calculators to our Alg 2/Trig classes like a textbook. They are responsible for it for the year, and turn it in at the end of their regents exam. If they lose it, they have to pay for it. We are considering trying this with all of our classes next year, i.e. adding alg and geometry to the loaning process. Do any other schools do this? Has it been successful? We are worried that the younger students won’t be as responsible, and lose them. Please let us know if you have tried this and how it worked out for you! Or, do you require your students to buy their own graphing calculator in their freshman year?