I'be been a professional gambler for 25 years almost exclusively in Nevada.
Luckily when I purged my trove of accumulated slot cards I did retain some that turn out to be at least somewhat hard to find.
I used The Slot Card Guide to identify the few that I have that are listed at $3+.
I've scanned the fronts+backs into 2 pictures in groups of 10. I have 38 cards in four sets of 2 pictures.
They are roughly sorted by value according to the guide.
In addition I do have some duplicates such as Primmadonna, Mirage, Monte Carlo.
I'm moving 1/2 way 'round the world and need to lighten my load :-)
Here is group1: