Ann: Altura Completes October Shipments of Lithium Concentrate, page-143

Neither ALB nor Tianqi reports on Greenbushes costs and production. Concentrate shipped per quarter can be added up via the shipping listings from Bunbury.

The deposit is quite exceptional.
Had an estimate of 157mt @2.25% LiO2 as of 30/09/15.
Low strip ratios, some areas of the pegmatite are so rich that the ore naturally reaches 4-5% LiO2. They barely have any concentration to do when chewing through these.
The mine is located only 40km from the Bunbury port.

It's pretty safe to assume their costs are in the low 200s.