sable
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I just happen to see it on Drs Foster and Smith site. Possibly they have their hands on it.
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The most recent information is that Novartis "hopes" Interceptor and Sentinel will be available again in January 2013.
I've put mine on Heartguard with no ill effects, except for Pixie who I still have on the last of my Sentinel. Since she's prone to seizures I don't use flea and tick preventatives on her and Sentinel protects from everything except ticks. I am really hoping I can get Sentinel for her before I run out. Otherwise, I'm thinking of trying her on Revolution.