Adderall XR/Vyvanse

I was recently diagnosed with ADHD, and prescribed Adderall XR 20 mg- the generic brand. I am aware of the Adderall shortage, however, I was wanting to see if anybody else knew what pharmacies had them in stock frequently? lucky and got my first bottle within a few days of my prescription being sent out. I'm just worried about possible withdrawals if I suddenly have to stop taking them due to not being able to find them. I'm just trying to create a list of pharmacies that I can call if my main pharmacy is out of stock. Thanks in advance.