The Surface Pro X and Surface Laptop 3 are upgradable, but only a little - The Verge
Amazon.com : Microsoft Surface Pro 3 Tablet (12-Inch, 64 GB, Intel Core i3, Windows 10) : Electronics
Amazon.com : Microsoft Surface Pro 3 (4GB RAM 64 GB SSD, Intel Core i3, Windows 8.1) : Electronics
Amazon.com : Microsoft Surface Pro 3 Tablet (12", 256 GB, 8GB RAM, intel i5-4300U 1.9GHz, 5MP Camera, Media Card Reader, Windows 10) : Electronics
Microsoft Surface Pro 3 Intel Core i7 CPU 8GB RAM 512GB Storage 12.0" Tablet PC PU2-00001 - Newegg.com
Microsoft introduces Surface Pro 3: the tablet that can replace your laptop
Microsoft Surface Pro 3 - Laptop / Tablet - Intel Core i5 8GB RAM 256GB SSD Storage - Windows 10 - 12" ClearType Full HD Plus Touchscreen Display - 2160 x 1440 Resolution
Yourui Main Board For Microsoft Surface Pro 3 I5 Cpu 4g Ram Motherboard Mainboard Full Test - Laptop Motherboard - AliExpress
Restored Microsoft Surface Pro 5th 12.3" - Intel Core I5 - 8GB RAM 128GB Storage - Windows 10 - Pre-Owned - Walmart.com
Microsoft Surface Pro 7+ Bundle - 12.3" PixelSense Touch - Intel Core i5 - 16GB RAM - 256GB SSD - includes Type Cover - Windows 11 - Sam's Club
Can you add RAM to Surface Laptop 3? - SurfaceTip
Restored Microsoft Surface Pro 3 12-inch Tablet Computer - 4GB Ram, 64 GB Storage, Intel Core i3 Procesor, Windows 10 Pro (Refurbished) - Walmart.com
Refurbished: Surface Pro 3 - Core i7 - 8GB Ram 256GB Storage - Windows - Grade A - Newegg.com