I like have my "crash" mat for learning new tricks.
First I borrowed the dog pillow, I bean bag chair is another good choice.
Then I found a folding exercise mat at Target ($30) which is great as an exercise mat (my bony ass needs two yoga mats) and I can fold it to be a good crash mat, but I don't always end up positioned over the mat.
As I'm working toward more advanced tricks, i would like to get a real one, for practicing those things for the first time.
I also agree with Charly that it's important to learn how to control a fall. My first real fall I was outta luck, there was no way to catch myself headed face down into the floor, but I did manage to break the fall with hands/arms, and didn't hurt myself. From the stunned, ashen looks on the rest of the class, I thought for sure any moment there'd be searing pain and gushing blood, but I was really fine! So I got back on the pole, didn't want to lose my nerve, and the instructor recommended using shoes for traction, but when I got down to the floor one fell off and hit me in the forehead.
Oddly, I was the only one laughing.
Since then I've learned when I don't really have the grip, or the balance, and let myself into a controlled descent before I totally fall. I've been wanting to try bow & arrow, but was definitely going to attempt for the first time without a spotter, so I did that at a studio's open house night. I have attended classes in July and August because of hand surgery that would have meant missing half the classes, but I was able to practice at home during part of this time.
Also, now I'm finding it hard to get advanced training at a local studio, so I've been using Veena's lessons.
Some things, like the Superman (or Dove) fall, I would not attempt without benefit of a mat below me! for what I'm doing now, my folding mat is sufficient, but Santa knows what's on my list!