Panda Mount: 100k Gralats
Blue Ghost Horse: 50 Tokens
Purple Ghost Horse: 80 Tokens
Donkey Mount: 8k Gralats
Gryphon Mount: VIP, 7500 Gralats
Noob Mount: 3 Gralats
Turtle Mount: 50k Gralats
Broom Mount: Witch Quest, Free
Chicken Mount: Easter 2013, Free
Cloud Mount: 20k Gralats
Scorpion Mount: VIP, 7500 Gralats
Purple Eyes Version of the Red Eyes Horse In Stable: 500 Gralats
That's all I can remember from my horse list.
challenge accepted