"Harvesting" slot cards at the Taj Mahal is like finding sand in the desert.
On a typical weekend, its almos impossible to stand anywhere in the casino and not spot a slot card waiting to be picked up.
I, like you don't collect cards. I, like you always come home with a bunch.
I figure, just incase the bug bites me

The tougher cards to find are the 1st issue vertical purple cards where the names were screened on in gold rather than embossed.
The 2nd issue same as above but embossed
The Aqua cards and especially the gold version of that card which was individually numbered and limited to 10,000.