Micron's 1.5TB MicroSD card is costly but awesome for the Steam Deck or Switch
SecureData 5TB SecureDrive DUO USB 3.1 Gen 1 SD-BK-20-GM5000GB
Amazon.com: SAMSUNG PRO Ultimate microSD Memory Card + Reader, 512GB microSDXC, Up to 200 MB/s, 4K UHD, UHS-I, Class 10, U3,V30, A2 for GoPRO Action Cam, DJI Drone, Gaming, Phones, Tablets, MB-MY512SB/AM :
Amazon.com: USB C SD Card Reader with USB 3.0 Port | JSAUX 3-in-1 USB Type-C Micro SD Memory Card Reader OTG Adapter | Compatible with iPhone 15/ Pro Max/Pro/Plus, iPad Pro, MacBook
SanDisk Unveils the World's Largest microSD Card, A 400GB Monster | PetaPixel
1.5TB (1500GBs) Class 10 Micro SD XC Memory Card with Adapter | eBay