Finally, on the 23rd of Feb, Coinbase announced support for Bitcoin Segregated Witness (SegWit) transactions. Over the next few days, they will be gradually enabling SegWit compatible Bitcoin sends and receives for all it's customers. To learn more about SegWit and the Coinbase integration , visit the SegWit FAQ page from Coinbase.
See the full article here
EDIT - I just sent some BTC from Coinbase, it cost $0.18!