Not too long ago there was a discussion about the House Brand shirataki
noodles (http://www.house-foods.com/).  I was not able to locate these
locally but I did get some via the web.  They were very good and looked
like regular pasta.  I mostly served them in a broth and I enjoyed them
enough to order more.  I continued to check Asian markets for shirataki
though, and I was able to find some JFC shirataki at Grand Asia Market
in Cary, NC.  They were about $1.50 for a 7 ounce pouch of noodles.  The
nutritional information for the entire bag is:

JFC (7 oz)
Calories:  23
Carbs:  5
Fiber:  0
Fat 0
Sodium 0
Protein: 0

House Tofu Shirataki (8 oz)
Calories:  40
Carbs:  6
Fiber:  4
Sodium:  30
Fat:  1
Protein:  2

They tasted fine but they were grayish in color rather than
putty-colored like semolina-based Italian pastas.

As you can see, there is no actually nutrition in the JFC shirataki,
however, if you were looking for a soup noodle that was not calorically
dense, they would be a good option.  If you are looking for a
pasta-replacement for Alfredo or marinara sauce, however, the tofu
shirataki would probably be a better choice.