Darren,
Yes I have the 3/16-27, 5/16-25, and the rarely encountered 7/32-33 taps still in stock. I have not had the dies made as external threads I usually cut on a lathe, but the next time I reordered taps I was going to make inquiries to the firm about having dies made. But I predict at 2-3x the cost of the tap that they would be too expensive to sell.
Last time I shipped a tap to AU at the beginning of the year, postage to AU was about $12US.
-Doug