Amazon.com: SanDisk 256GB SDXC Micro Ultra Memory Card Works with Samsung Galaxy S10, S10+, S10e Phone Class 10 (SDSQUAR-256G-GN6MN) Bundle with (1) Everything But Stromboli Multi slot SD and Micro Card Reader :
Best Buy: Samsung Galaxy S10 with 128GB Memory Cell Phone (Unlocked) Prism Prism Black SM-G973UZKAXAA
Samsung Galaxy S10 Plus Motherboard Replacement - iFixit Repair Guide