Polaroid stopped making instant film a couple of years ago, hence the rareness of it.
Cheers, Tony. That would make sense.
Polaroid is not something I've ever bothered with. We had one at work and the quality was rubbish and film expensive, but very useful as we needed instant photos.
Now polaroid is practically dead I find myself using 'polaroid' settings on my phone to take pictures.

The idea was that wedding guests would take photos and write a message on them, replacing a guest book. Don't think they'll go for anything too techy (useful link though).
You could get a polaroid pogo printer and paper for it. Search amazon (via the affiliate link

)
That looks interesting. Might be out of their budget, but seems simple and about as close to instant as you'll get without forking out for film. Cheers sps.