WD BLACK SN770M 1TB Internal SSD PCIe Gen 4 x4 M.2 2230 for ROG Ally and Steam Deck WDBDNH0010BBK-WRSN - Best Buy
Amazon Has a 4TB Corsair MP600 CORE XT PCIe Gen4 x4 M.2 SSD for $160 - IGN
CORSAIR MP600 MINI PCIe Gen4 x4 NVMe M.2 SSD – M.2 2230 – Up to 4,800MB/sec read – High-Density TLC NAND – Great for Steam Deck and Microsoft Surface - Newegg.com
512GB M.2 2280 NVME DLX4 PCIE GEN4 X4 OPAL 2.0 SSD SED | Dell USA
Patriot P400 Lite Series - M.2 2280 PCIe Gen4 x4 Solid State Drive
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Amazon.com: Corsair MP600 CORE XT 4TB PCIe Gen4 x4 NVMe M.2 SSD – High-Density QLC NAND – M.2 2280 – DirectStorage Compatible - Up to 5,000MB/sec – Great for PCIe 4.0 Notebooks
CORSAIR MP600 MINI PCIe Gen4 x4 NVMe M.2 SSD – M.2 2230 – Up to 4,800MB/sec read – High-Density TLC NAND – Great for Steam Deck and Microsoft Surface - Walmart.com