Mounts can be bought at the pet sell rooms in Bonta and in Brak. They are bought in certificate form and have to be exchanged at a private paddock or if you don't have access to a private paddock, a public paddock. Public paddocks are also in Brak and Bonta.
When checking for what mount you wish to buy, look very hard at the mounts statistics. If you buy a wild mount you will not be able to ride it, and if you breed it it wil run away. If it is a male it runs away after mateing, if female it will run away after giving birth and you will never see your turkey again. Please ensure you buy a tame mount.
Depending on your time and needs check also that your mount of choise is mature. If the maturity bar in the statisics is not full you will not be able to ride your mount as it is just a baby (awwww) If you purchase a baby you must be willing to take the time needed to make it mature and mountable.