I bet you could get 80 classics maybe under $500 especially if you contact YYJ and tell them the situation
The folks at YYJ are super nice, generous, and also have stellar communication! I’m pretty sure they would gladly help you out! 
Peter Fish Luminators… Cheap String Trickin Responsiveness. Honestly can’t believe nobody said this, that’s why I didn’t come to the thread earlier
They were like $1.99 or something at Walgreens a couple years ago. I know that adds up for 80 kids… but maybe you can e-mail the Peter Fish guys and they can cut you a deal. I imagine they ordered thousands of these things and would be happy to get rid of Eighty at once… I can send you one to see how you like it… It’s perfect for kids too.
Just contact yyj to see if they will give a discount on bulk classic