Dear Johnny,
Each Lens is normally 6,300 and half would be 3,150. We don't allow another discount on top of that. I made it 15,000 for the batch just to be nice, and because you've been so helpful in obtaining materials for us. Credit is fine, and you have more than enough to cover it.
However, you need to bring in 5 more fine amethysts right away. You delivered only 20, and each Lens requires 5 of them to make the 5 Gems of Light required. Thank you for your business.
Ferrit