We got the Pet Parade one from amazon. We LOVED it!! Best $10 ever spent. Jackson is not a big barker at my house by himself but when we visit my dads with their 2 dogs... barking can get a bit out of control. The bark repeller worked amazingly and they got the point real fast. Soon all we had to do was say 'quiet!' and they would listen. Just don't over-use and use it correctly. It should be used as a training tool, don't always rely on the remote. Unfortunately, the battery died after about 2 months and it stopped working when we tried to replace it.
But it was only $10 and we're gonna buy another one.