I'm guessing you mean they have gone out of stock and you don't know how but I'll tell you how anyway.
1. Log into Toribash *duh*
2. Go to Shop
3. View All Items By Colour
4. Change the colour option to Orc
5. Find the Orc force and buy it.
Items go into stock every 1st day of the month.
eg. Jan 1st, Feb 1st, Mar 1st, and so on...
Hope this helps