Discounts based on quantity - how to?

Just rereading your original post...

If you are simply selling all the photocopies in one sale then it shouldn't be too difficult for your dealer to script, but it all depends on their level of skill and they may well charge you for writing the script for you as well.

The other option is that your staff simply count up the total number of copies and press the button to sell them at the right price level.