Can't live if living is without you. Do you stockpile your favourite products - just in case?

I only recently discovered what just may be the perfect mascara for me - Stila Major Lash. It gives my lashes volume, length and the perfect curl. It is a lovely inky black and yet it doesn't smudge or flake off. It just may be my Holy Grail of mascaras.

And then things started to go wobbly for Stila. They seem to be back on track for the moment, but I don't know if they'll have a counter here again any time soon. I can get the mascara online, however. So what do I do? Buy as many as I can and store them carefully? Use up the one I have and look for something new? Even then, at the rate mascaras seem to be discontinued, there's no guarantee the new Holy Grail will be available for any length of time either.

So tell me, what do you do when you discover the perfect product? Do you buy it in multiples and stockpile it or do you use it and keep looking for something new?