http://www.pistolgear.com/products.php?id=46
"Get a Glock."
They do have a single stack 45. The G36. 'Course like other baby Glocks - a little on the thick side, it may not fit your criteria for "subcompact".
Actually that is the one I was thinking of, but I meant a single stack 9mm. I need to get a hold of a 36 and try it out.