I have 2 - 1U dell servers for Sale.  Looking for $100 each. Both have 
run CentOS 6 and 7 for years.  Don't need them any longer.  All 
components work fine.

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Unit 1: Dell R300

1 x 2.66 Ghz QuadCore Intel CPU

16GB RAM

2 x 73GB 15K HD

Dual Power Supply

Dell Rapid Rails

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Unit 2: Dell Poweredge 860

1 x 2.8 Ghz DualCore Intel CPU

8 GB RAM

2 x 500GB HD

Single Power Supply

No Rails