Come on, we had to do this at some point, I might as well it now 
For those who need a reminder, the Snap cards are amongst the rarest of the rare. I don’t know a huge amount about them DJ’s friend did some translating over at the 'gym which I’ve kinda stolen for here:
These special cards were made as part of a campaign, which was in memory of the release of nintendo64 game “pokemon snap”, a game where you become a cameraman and take photos of pokemon. The dreamlike contest was this, they selected the best photos contributed from the fans, and these photos were made into a pokemon card which was given as a prize for the winners.
and pic:
(hope you don’t mind me taking your pics smpratte, let me know if you want me to upload my own!)
The translation is for the text on the page in the pic.
I believe they actually came in two different contests, as per bulbapedia.bulbagarden.net/wiki/Illustration_contests#CoroCoro_Pok.C3.A9mon_Snap_Contest (and this is something all of the main dealers I’ve spoken to agree with)
In terms of how many exist, I have never got a definitive answer from anyone. They are not in the hands of anyone on here (I’m assuming), which is surprising given the calibre of collectors here.
viper.fox mentioned one was on Yahoo auctions about a year ago, so my question to her and everyone else is how much did it go for?
Post all other info about the cards here too, maybe one of us can mount a bit if another shows up!