MacBook Pro "Core i5" 2.7 13" Early 2015 upgrade factory SSD with Intel 600p?
I've seen that both MCE and Transcend make drives to upgrade MacBook Pro/Air with PCIe SSDs. Here are links to the options, which are cheaper than OWC:

MCE - http://store.mcetech.com/mm/merchant.mvc?
Transcend - https://us.transcend-info.com/apple/jetdrive/