One important thing to note is that USPC has 2 different versions of these cards. One is the smooth snappy one you probably got from your friend. These have the words "Smooth finish" on the box. There is also a version that is on a stock almost identical to Bikes. I have been using the smooth finish for over a month now and they have become one of my favorite decks for handling and durability.
All of the previously mentioned sources are a good place to buy them. If you have any trouble, send me a PM and I can link you to a friend of mine who sells them.
Malik