OK so you may know that this is my closed species well I am willing to sell 15 slots (so I can get the money I need) where people can make their very own Knife tail pony.
The prices are listed below:
Warrior position - $5 as it is the most common possession known, most knife tails fall into this position.
Squadron Leader - $8 as they are in command of the Warriors and have responsibility over them.
Guard - $10 these actually have more power than the Squad leaders as they have to make sure nothing threatening enters their home.
Captain - $20 the second highest position available for a Knife tail to gain.
Commander - $30 the Knife tail in this position holds the same power as any of the princesses and is the strongest Knife Tail who usually has the largest knife.

Openings:
1 - open
2 - open
3 - open
4 - open
5 - open
6 - open
7 - open
8 - open
9 - open
10 - open
11 - open
12 - open
13 - open
14 - open
15 - open

The rankings are easily recognisable by the markings on the pony's face:
http://www.furaffinity.net/view/16305080/