Factional mounts: Apprentice
These mounts give a 60% speed increase on land. You can purchase these mounts from <Kodo Mounts>, in Bloodhoof Village in central Mulgore so long as your character has riding skill of 75 (obtainable at level 20). If you are playing as any race other than a tauren, you will also need to have Exalted reputation with Thunder Bluff.
Factional mounts: Journeyman
These mounts give a 100% speed increase on land. You can purchase these mounts from <Kodo Mounts> as well, so long as your character has riding skill of 150 (obtainable at level 40). They are reputation restricted like the apprentice mounts.
Other Kodo mounts
These used the old kodo mounts graphics and are no longer obtainable. They can be exchanged for the newer variety if desired.