My vet said they do not know how long it will be until shipment is resumed. He recommended going with Heartgard for now and switching back when Interceptor is definitely available.
Thanks for the responses! I did a little searching today and found out that the following are out of stock on Interceptor or have it on backorder with no in stock date available:
Foster's & Smith, KVVet, Vet Depot, Total Pet Supply (Canada), my vet.
Note: Vet Depot had the lowest price (today). Prices for 12-month is $71.67, 6-month is $40.27. (My vet charges $58.75 for 6-month but will give me a script to send in.)
Our Novartis rep said they are looking at a minimum of 6 weeks before they begin to get back to normal manufacturing at the Lincoln plant. Who knows how long before they catch up on all the backorders. They did have some at another warehouse they were allotting to hospitals who typically order a lot of Interceptor. Deramaxx 25mg tablets are also b/o right now. They are shipping the 100mg, but it is taking 2-3 weeks from when the order is placed.