I emailed where I get Armour from as I heard it was going to be almost impossible to get. Here is their response.
As far as I am aware, we are not experiencing any issue with supplying Armour Thyroid nor will we be experiencing any.
Should any circumstances change, we will of course notify our customer. However, at present we do not expect this to happen as the manufacturer would have informed us of this change.
Should you require further information, please let me know and I will be happy to help.
Customer Service Advisor