http://en.wikipedia.org/wiki/Fipronil

I hav been out of the loop...
I meant to grab some Frontline at TSC today, since they had it on sale this week.
They had non in the shelf and I was too tired to engaged an employee to help me find any. They had some stuff in the helf though, half the price even regular priced, suggesting it contained the same active ingredient.
http://en.wikipedia.org/wiki/Fipronil

Wiki says Petarmour does the same.
Now the million dollar question: Is that safe on cats?
I have a bit of a mush brain today, long day yesterday, stressful one today and not a single ray of sunlight in two days!