Film and Amazon...

 One thing about Analog Film is that it's about chemistry and not 1's and 0's.

That said, film has an expiration date.  Typically, you can get by if it's not too expired.

Instant film - especially Polaroid is really expensive.  The great deal on Amazon generally means the film has already passed its expiration date.  

So, a word to the wise, unless duly noted on the expiration date, buyer beware.

I think I'm good with the film expiring only a few months ago.  The old rule is that a year is perhaps still ok depending on how you store it.