As for the SSDs in the later rMBPs, here is one option: https://eshop.macsales.com/shop/ssd/owc/macbook-pro-retina-display/2013-2014-2015
Or you could find a genuine Apple unit on eBay possibly. Honestly, you're probably better off storing extra stuff on an external USB 3.0 drive. And, yes, you can encrypt the external drive assuming you re-format it to GPT/HFS+.
The 13" rMBP does not have the dGPU as an option. Only the 15" rMBP.
Or you could find a genuine Apple unit on eBay possibly. Honestly, you're probably better off storing extra stuff on an external USB 3.0 drive. And, yes, you can encrypt the external drive assuming you re-format it to GPT/HFS+.
The 13" rMBP does not have the dGPU as an option. Only the 15" rMBP.