Just bringing this current for anyone else finding this question:
AMD64 SBCs with NVMe:
ROCK Pi X - Intel Z8350 (32/64bit), 1GB/2GB/4GB RAM - specs - shop.allnetchina.cn (thank you Trent)
LattePanda (thank you astronautsupplier)
- LattePanda Alpha 864s, Intel Core M3-8100Y, 8GB RAM - specs
- LattePanda Alpha 800s, Intel Core M3-8100Y, 8GB RAM - specs
- LattePanda Delta 432, Intel Celeron N4100, 4GB - specs
Odyssey X86, Intel Celeron J4105, 8GB RAM - specs
Pine64 ARM SBCs with NVMe:
ROCK PI 4 - RK3399, 1GB/2GB/4GB RAM - specs (thank you Strit)
NanoPC-T4 - RK3399, 4GB RAM - specs
NanoPi M4B, RK3399, 2GB RAM - specs, requires NVMe hat
NanoPi M4V2, RK3399, 4GB RAM - specs, requires NVMe hat
Other ARM SBCs with NVMe:
Banana Pi BPI R64, MediaTek MTK MT7622, 1GB RAM - specs
Raspberry Pi Compute Model 4 using the TOFU Carrier