is SSD of Macbook Pro Retina Display upgradable
I have recently purchased (19th November,2014) Macbook Pro, Retina Display, 13' i5 Processor with SSD 128 GB. Now I badly want to expand my SSD with another 128 GB. Please advise me how I will do that. What is the cost for it?
MacBook Pro (Retina, 13-inch, Mid 2014), OS X Yosemite (10.10.2)