Khurasan Miniatures has just released their Earthdoom line of figures. These are 15mm figures, but the first 2 releases are rather tall.
Below are the first two sets. The Corsair Battle Dress (35mm tall) and the Intruders (20mm tall). The Corsairs are sold individually for ($5.99) and the Intruders come 10 to a pack for ($9.99).