When I dropped by Z's Toys yesterday I found that a customer had ordered a Mugen from Samurai Champloo and they had ordered an extra one. I resisted for about one minute, then bought it. My friend at Z's said he would keep an eye open for the other two.
Mugen cost $9.99. He comes with a spare head, sword and sheath, a snack on a stick, and a base. No articulation. as such.