See if Tritronics sells over there. It has worked wonders for my problem barkers. It has 5 levels of correction, and a memory function that can tell you how many times it went off while on the dog. It's the best I'm aware of, and I've tried a couple inexpensive ones that didn't do the job.
You might want to call it a bark collar instead of a shock collar. I think a lot of members might be put off by the title and not read your post.