The T9 is a rare duck alright. Judging by the serial numbers, only a few are made each year, maybe as low as 150 or so. They do seem to made during limited periods as well. This explains why many people have never even seen one in a gun shop.
They are still being made and if you're into Kahrs, they are a great addition to your collection. The T9 is different from a K9 in that the takedown process is easier on the T9, otherwise very similar. I've always compared the T9 with the HK P7, two guns that are as similar and alike as they come.
The polymer TP9 is the samne size but easier to find.