Get your first postcard for free when you download the SnapShot Postcard App.
Use a picture from your phone or even take a picture with the app open. 5 minutes later, it's a postcard on the way to your mom, boyfriend, cousin or whoever you want to sent it.
The best part is the first car is FREE!
Did I mention it is free?
After that the prices range from .99 to $2.00, I think. See their terms and conditions for exact pricing.