M1 Mac RAM and storage can be upgraded after purchase, but it's not easy - 9to5Mac
How to Upgrade MacBook Pro SSD Storage (Touch Bar, 2016-2020): EveryMac.com
Apple Mac Pro 1,1-5,1 SSD Controller PCIE Card Upgrade Kit *SATA III RAID *10.15 | eBay
Photo tutorial: Upgrading a MacBook Pro with an SSD
MacBook Air 11" Early 2015 SSD Replacement - iFixit Repair Guide
Buy MacBook Pro - Apple
MacBook Pro 13" Retina Display Early 2015 SSD Replacement - iFixit Repair Guide
How to add a fast new SSD to your old Mac or MacBook for only $150 - 9to5Mac
SSD Upgrades for 2013, 2014, and 2015 MacBook Pro
SSD from a 2014 MacBook Pro works in Mac Pro 5,1 : r/macpro
Upgrading to an SSD for my MacBook 5,1? | MacRumors Forums
SSD Upgrades for 2013, 2014, and 2015 MacBook Pro
How to add a fast new SSD to your old Mac or MacBook for only $150 - 9to5Mac
Samsung SM951 AHCI M.2 PCIe SSD 512Gb For Apple MacPro 4,1 / 5,1 *Pre- – local338
MacBook and MacBook Pro (Non-Retina) SSD Upgrade Bundle – iFixit Store
New Dual SSD upgrade kit for MAC PRO 1.1 5.1 inclued (dual ssd tray/ sata cable/ sata3 card /SATA3.0 Hard Disk Data Cable)|sata3 card|dual ssdssd dual - AliExpress
The Definitive Classic Mac Pro (2006-2012) Upgrade Guide