Best bet would be ebay.
The first one, Madarin Spawn from the 2nd Spawn the Dark Ages line is somewhat of a fan favorite. There are numerous paint variants and even a 12in version. All highly sought after. A new white repaint version was released as part of the last Spawn Reborn line not too long ago. The second is the 10th Anniversay Spawn figure released back in 2003 as part of the Image 10th Ann, line. The last is Eclipse 5000 the "Spawn" from the Nitro Riders line. Half the size of the average spawn figure due to the size of the bike. Can't remember when it was released but it could be about 5 years ago.
