Here are some pictures of miniatures appropriate for a Frag-o-rama game. Actually, any mini is appropriate if you can answer one question. Does the mini have a gun? If yes, it'll work.
Here's one of the cheapest ways to field 10 players right away. GZG's Israeli Assault Troops.
Here's a conversion I did on a Hellboy Indy Clix mini. Turned him from super Nazi to space cowboy.