Also consider sites like Ebay, wherein you might find enthusiasts that specialise in creating these sorts of instruments. Lots of people have lots of time on their hands. On another note, here is a particularly frightening example I have received from Peru:
[http://img139.imagevenue.com/img.php?image=81360_ocarina_122_705lo.jpg]
(Mind you, this is only the back of the Ocarina. Yet it still makes me cry at night.)
Edit: Now that I've thought about it some more, if you get really desperate, you might consider google-imaging Ocarina (or a particular subset it sounds like) and following the URLs back to where they originate. Sometimes, just sometimes, you can be lucky enough to follow them straight back to a store.