Most public health programs have some available to give away, but commercially they're rare because few people want to pay over a dollar per condom for them.

What makes them nice is you can safely put one in hours before sex happens. Add some silicone lube (which they don't have a problem with), wear a loose skirt, and you have a perfect setup for spontaneous sex in a risky location.

I think they have to teach you how to use it at the doctor and they give it to you. Not positive though.