Lexar SSD NVMe PCIe Gen3x2 NM520 M.2 2242 TLC HDD 128GB 256GB 512GB Internal Solid State Drive for Laptop|Internal Solid State Drives| - AliExpress
Team Group MP32 M.2 2280 256GB PCIe 3.0 x2 with NVMe 1.3 Internal Solid State Drive (SSD) | Help Tech Co. Ltd
I harvested a PCIe Gen3 x2 NVMe 1.3 SSD from my older laptop, the problem is that its length is short. I've held it in place with some tape, it should hold.