The supplies that you need to assemble a Raspberry Pi cluster are as follows:
1. Multiple Raspberry Pi boards (preferably the same model for compatibility)
2. Networking hardware (switch, router, or Ethernet cables)
3. A microSD card for each Raspberry Pi with an OS (like Raspbian or Raspberry Pi OS) installed
4. Power supplies for each Raspberry Pi
5. A case or enclosure to hold the cluster (optional)  

Software-wise, you will need a tool such as OpenMPI, k3s, or a Docker Swarm to manage the cluster.
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