Lenovo SSD M2 1TB Ssd NVMe 128GB 256GB 512GB M.2 Solid State Drive PCIe 3.0 ×4 Internal Hard Disk for Laptop Desktop Computer _ - AliExpress Mobile
BEWARE: Lenovo Thinkpad L15 Gen3 SSD is practically un-upgradeable. Laptop comes with 256GB and bigger SSD is too thick to fit. There also goes a cooling plate on top. : r/thinkpad