Hi again, Zoe! I didn't notice African Bird Seed Peppers listed, but have you looked at Horizon Herbs selection of Pepper seeds? Go down to the 1st listing - Pepper, Aji Colorado on the 1st webpage below.
Craig Dremann says that his rating system shows that there are other Peppers, such as the Wild Desert Tepin, that are even HOTTER than Savina or Bhut Jolokia (?)!