What can I say? This is certainly better quality and easier to come by than the double-facers I have made sanding & gluing.

There are a ton of great magic tricks out there in which you require a double faced card. There a also probably a ton of effects you could create on your own. If you're like me and you have a book in which you need one, here's probably the cheapest place to get one. Bicycle makes such high quality products that this will last you many many times. If you think you'll need a lot more, then try picking up a whole deck of them (also available from PenguinMagic)

I love a well placed gaff with sleight-of-hand.

My favorite trick with a double faced card has to be anniversary waltz. There is nothing stronger than taking two separate signed cards and combining them with magic.

I perform this all the time when I'm hired to perform for wedding receptions.