I bought mine direct from jinteddy in Malaysia for $38 before Turbulent was formed.
I assume it's the same...http://turbulentlabs.com/grado-black-manta/
They make a $50 version, but the $38 one is plenty nice to me.
I got the Onyx Manta ($50) headband and it sure is a quality product! Much comfier than stock, and i'm sure that as it beds in a little and becomes more supple, then it will get even more comfy :)