I feel sorry for anyone teaching more than 45 students per class.
Best I can tell you is read as many of Penny Ur books as you can, and try this. Make enough copies of handouts for ONE class. Do your best to inform the students that they are not to write on them, and that they will hand them in at the end of the class period. That way, you save on photocopy costs, and even if you don't get back every copy, you will probably get back most. Make 90 copies so you have 10 as a backup to fill the gaps on papers you don't get back.