How much is a combat trained Mammoth?

[Tumatan]

I have found 2 prices. 1)on d20pfsrd says a combat trained Mammoth is 4500 gp. 2) If you look up Mammoth in the D20 bestiary is says a small Mammoth is 13k. I would think it is the 4500gp price.

[Claxon]

The prices are probably derived from two different source books, with two different writers who used different methods to price it.