A bargain ?

Alice likes Advil; I am an Aspirin person myself, but I thought that maybe there was something to the Advil I did not know.
I take at most a couple of Aspirins a month unless I have a cold or drink way too much.
So today at Costco, buying food for The Worthless Ones, I saw the pharmacy department and decided to check for Advil.
They had a small box of twenty and an enormous box of generics for almost the same price.
I hailed the lady in the white coat behind the counter and asked
Are they the same ?
yes, she said.
But, I said, one has twenty tablets and the other has one hundred and two, and they cost almost the same. Are they really the same ?
Yes, she said again. Good brand, she said and pointed to the generic brand.
Well now, I thought. That is one big bargain and resolutely put the box of generics in my shopping basket.
When I got home I thought a bit more about it.
If I continue to take tablets at the rate I do now, I will have enough for ten years;
And the expiration date on this box is Jan 2010.
maybe it was not such a big bargain after all.
I have a head ache now,
Quick, the advil.