I've often seen round stickers used as office supply, that should almost exactly fit any regular sized die. That way you can cover up the holes and have your dice look pretty. You can draw a + and - on them or use different colored stickers to cover the sides.
For the long run you might want to consider ordering some off the internet. I am not sure about any shipping fees, so that might not be viable, but it can't be that bad, can it?