SK hynix 1T GB NVMe M.2 2230 SSD ( BC 711 ) 1024GB (Steam Deck Compatable) | eBay
Kioxia Updates M.2 2230 SSD Lineup With BG5 Series: Adding PCIe 4.0 and BiCS5 NAND
Amazon.com: Samsung SSD 512GB PM991 M.2 2230 30mm NVMe PCIe Gen3 x4 MZ9LQ512HALU MZ-9LQ512A Solid State Drive Compatible with Dell HP Lenovo : Electronics
1TB M.2 2230 NVMe PCI Express 3.0 x2 SSD (Solid State Drive)-30mm Half Size, Brand : Samsung PM991 MZ-VLQ1T00, KLFGGAR4AA-K0T0 For Microsoft Surface Pro X, Microsoft Surface Pro 7+, Microsoft Surface Laptop
Steam Deck has M.2 2230 SSD slot, but Valve does not recommend upgrading it - VideoCardz.com