Found 4TB PCIE SSD's priced at around 1k each used in a $300 R430 : r/homelab
Intel SSD DC P3600 Series PCI-E, 800GB, 2600MBs read, 1000MBs write, random 4k 70/30 read/write 110 000iops, 3 Drive Writes/day, NVME, ultra low latency for sale at Ahead-IT
SSDPEDKE020T701 Intel Express Card 2TB Solid State Drive
SSDPE2KE032T701 - Intel DC P4600 3.2TB Triple-Level Cell PCI Express 3.1 x4 NVMe 2.5-Inch Solid State Drive
SSDPE2KE032T701 - Intel SSDPE2KE032T701 dc p4600 series oem 32tb pcie nvme 31 x4 3d nand tlc 25inch 15mm solid state drive - serverevolution.com
Intel Optane Ssd Dc P4600 4tb Sata Solid State Drive Ssd Enterprise Server Hard Drive 3 Years Warranty - Rams - AliExpress
Amazon.com: Intel SSDPE2KE064T701 DC P4600 6.4TB NVMe PCIe 3.0 3D TLC 2.5" 3DWPD, FW QDV10190 : Electronics
Drives In Detail, Part 2: Intel P4510, Optane P4800X, Memblaze PBlaze5 - The Enterpise TLC Storage Era Begins: Rounding Up 13 SSDs With Samsung, Intel, and Memblaze
Intel SSD DC P4600 NVMe PCIe Review: Low-Latency TLC Storage For The Data Center | HotHardware