I've wanted to try that for a long time.  I just haven't been able to bring myself to pay what they charge for it...yet. 

I haven't used one but I am going to follow this to see what is said.

Consistency is key in any kind of training when it comes to puppies. With potty trainig it is good to know when they normally go, so you can be proactive. The key times are when they first wake up, after they eat, and after playing. Just be sure to get them outside immediately after all … Read more

Feed then walk, reward for any outside business done you can reduce the rewards once potty trained.  Restrict the puppy to a certain area say den and kitchen, wherever you spend most of your time and watch him/her usually they'll run back and forth sniffing out a spot you'll soon learn to recognize the signs.  … Read more