16-inch MacBook Pro Teardown - Thick Battery, No Upgrade Options, More
Apple Macbook Pro 13.3" 2.5 GHz Core i5, 500GB HDD, 4GB DDR3L RAM - MD101LL/A (Non-Retail Packaging) - Walmart.com
OWC 16GB (2x8GB) ram Upgrade PC3-12800 DDR3L 1600MHz sodimm 204 Pin CL11 Memory Upgrade Kit Compatible with Late iMac, Mac Mini, and MacBook Pro Computer at Amazon.com
Macbook Pro Apple 13" inch Catalina 10.15 (2012-2014 model) w/ 16GB RAM Upgrade! | eBay
Apple MacBook Pro 13" (2019) Refurbished 2880x1800 Intel 8th Gen Core i5 with 8GB Ram Intel IrisPlus 655 512GB SSD MV9A2LL/A - Best Buy
macbook pro - Can I upgrade RAM on late 2013 retina Mac Book Pro? - Ask Different
Add more RAM to your MacBook Pro (photos) - CNET
MacBook Pro 17" Unibody RAM Replacement - iFixit Repair Guide
M1 Mac RAM and storage can be upgraded after purchase, but it's not easy - 9to5Mac