I salvaged an airhorn from our firetruck.

I'm planning to install it just behind the front grill. When I plugged it into my portable airtank, the sound it made was MOST IMPRESSIVE! It made your standard car airhorns sound like a kid's plastic whistle. Now, what I need is a high output direct drive air compressor like this one to power it:
http://www.marinco2.com/showProduct.asp?p=10102
This company does not sell directly and they don't have any distributors in Canada. I've checked a couple of marine equipment shops in town but no luck. I've even searched on the west coast and again, noone sells these compressors.

I don't think those little compressors that come with your typical Fiamm airhorn kits will put out enough juice to make this thing tweet. And I don't wish to spend hundreds of $$$$ installing an airtank, low output compressor and valve system to make this work.

Any help on where I can get a compressor like in the link I put up?