What deals can we make to sell glass classes better? If they buy two classes at once can we do a discount, or if they’re able to book a full class at once can we incentivize that? Home › Frequently Asked Questions (FAQ) › Information › What deals can we make to sell glass classes bette.... Posted by Steve K on March 12, 2024 YES! You can give up to a 30% discount if they book a full class. If they buy two classes you can work them a 20% discount.