It is $10 because the money from individual kits is being used to subsidize the foldscopes for classroom kits. See "Why the difference in price between Deluxe

It is $10 because the money from individual kits is being used to subsidize the foldscopes for classroom kits. See "Why the difference in price between Deluxe Individual Kits and Classroom Kits?" in the FAQ: https://www.foldscope.com/faq https://www.foldscope.com/faq