Rebel miniatures just came out with some really cool gladiators in 15mm. As of now they only have a pack of four for $2.99. They are a Hoplomacus(with spear) a Myrmillo/Dimachaerii, a Thracian and a Not Theokoles from the show Spartacus(although he is not any bigger than they others)
All the figures are well sculpted with nice detail and were fun to paint up. I really hope they make some more.
pictures on my blog.
http://bandit86.blogspot.com/