You want to get those cards or other yoga books at a substantial discount
at
www.bookdepot.com
I just checked and they don't have any in stock right now.
But I've used them for years and things come in to stock frequently.
They have about 50 yoga items in stock.
Some of the items listed under yoga don't have anything to do with yoga.
There is a minimum order of 50 so you might want to team up with a friend unless you are buying for a bunch of classes.
Peace.
Harlan