Another good source are Frostgrave, Perry miniatures, Wargames Atlantic or Mantic. By far cheaper than Games Workshop (but I agree, their Underworlds and Warcry minis are wonderful), and ideal for kitbashing, like this guy.
I'm a huge fan of the Frostgrave boxes. Really inexpensive for a load of great minis.
Another good source are Frostgrave, Perry miniatures, Wargames Atlantic or Mantic. By far cheaper than Games Workshop (but I agree, their Underworlds and Warcry minis are wonderful), and ideal for kitbashing, like this guy.