They don't sell the avatars at the store. I'm still unsure if they charge for getting one. If you post what you are looking for, a specific moment in a fight or just a general request someone might make it for you. Ppl here are pretty good about trying to get ppl the avatars they want.
Here is the link
http://www.fightforum.com/fightforum...st-thread.html
After you get one, ask a admin to put it up for you.