Unfortunately, some manufacturers restrict us from discounting their product. Here's a list of the brands we're unable discount:
Storz and Bickel
We should also point out that when multiple discounts are available, only one can be applied. If an item's price has already been reduced or otherwise discounted then its not eligible for any additional price decreases. Products that are bundled together like the Stax kits and the Mega Pack are already discounted for instance.
But don't worry, we've made sure you get your money's worth from your 420 Science purchase by including free items like grinders, storage bags, and cleaning tools when you buy a non-discounted item.