Got specific hardware you recommend for new users? List it here.
You can also see this class thread going since 2016 titled Best cheap hardware to run Nextcloud on.
The rules
- Must be 64-bit architecture. This means arm64, x86-64 or Risc-V or anything else that supports 64-bit.
- At least 4gb of ram minimum.
- Gigabit ethernet.
- Please include a link and cost.
Devices or expansion accessories? Edit the post and list them below. 
- Odroid HC4 - 4gb ram. Dual 3.5" SATA disks in toaster layout. $74
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Raspberry Pi 4 Compute Module (requires expansion board) 8gb ram - $75
- Radxa Taco expansion board adds 5 disks, NVME, and 2.5gb to the Compute module over PCI-E. $95
- Rock Pi 5 Model B Wifi 6E, NVME, USB 3.0, higher model has 16gb ram. $149 - $169
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RockPi 3A 8gb ram, NVME, USB 3.0. $85.00
- Quad SATA Nas Case over PCI-E. Holds 4 x 2.5" disks. $129
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Raspberry Pi 4 w/ 8gb ram. USB 3.0 disks.. $75.00
- add SSD external disk for improved performance. 1tb is around $100.00 - $200.00
- Quad Sata NAS Aluminum case over USB 3.0 for 4x 2.5" disks. $95
- The Pi 4 is almost four years old, so it notably lacks NVME or Sata ports or PCI-E support. Other devices will perform better, but it remains super popular.
- add a device