Pharmacy says they can't fill script anymore?

I went to pick up my zenzedi from the pharmacy I have been consistently getting it from for 2 years and they told me they cannot afford to buy it anymore. I didn't even know this was a thing??? I'm unsure of what to do. All of the pharmacies around me said the same thing and only have Vyvanse or a patch available as the brand name. What do I do in this situation??? I don't really want to go back to generics because the side effects were terrible.