your nearest lfs should have some small silvers. or you could buy them online. most online stores have silvers instock but blacks need to be searched for.
Probably your best bet is to ask one of your local better aquarium shops order in a few for you. I bet you could find them available on line (aqua-bid, etc.) but the shipping will add lots of money to the price. They are not as readily available as the silvers but I know they are available. A couple of the importers I deal with have had them within the last couple weeks.
None of our sponsors can hook you up? I mean, that is the reason they are here is to provide sales for the members. Of course, if you don't have any available where you are, then you definitely would have to pay shipping.