Toshiba BG4 Single Package M.2 2230 30mm NVMe SSD Review
Amazon.com: Western Digital 1TB SSD PC SN530 M.2 2230 PCIe Gen3 x4 NVMe 1024GB SDBPTPZ-1T00 : Electronics
Theoretically, this 1TB M.2 2230 SSD should be compatible with the steam deck and might be a great addition to a 64GB model for adventurous modders : r/SteamDeck