An Orange Pi 5 Max does this job for real. It's an RK3588 board — $75 for 4GB, $95 for 8GB on AliExpress. A community test got Qwen2.5-0.5B at about 12 tok/s on the CPU via llama.cpp. The chip also has a 6 INT8 TOPS NPU if you'd rather go the RKNN route. Won't beat a Mac Mini, but it's an actual computer for under a hundred bucks.