Some recent Bitcoin mining rigs auctions on eBay:

Assembled Crypto Coin Currency Open Air Mining Rig Frame Case 6 GPU
$66.89
End Date: Saturday Aug-12-2017 8:59:19 PDT
Buy It Now for only: $66.89
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Bitcoin Ethereum Litecoin Zcash 6x Radeon RX 470/480 4GB/8GB Mining Rig 160MH.
$3,699.99
End Date: Sunday Aug-13-2017 3:40:31 PDT
Buy It Now for only: $3,699.99
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FLOW 6.1 GPU Mining Rig Open Air Frame Computer Case Chassis with 6 USB Risers - Ethereum ETH Bitcoin BTC

  • Supports up to 6 GPUs and 2 power supplies for maximizing mining potential.
  • Comes with 6 PCI-E 16x to 1x USB Powered Riser Kits for secure and reliable connections and consistent power delivery.
  • Strong, light-weight and high-quality black aluminium frame coupled with piano black acrylic panels.
  • Includes all needed screws for attaching your hardware: power supplies, GPUs, motherboard, and hard drives .
  • Space economizing footprint: 14.5 inches wide, 11 inched deep, 21.5 inches high.
MintCell FLOW 6.1 Mining case is designed for building professional crypto-currency mining rigs. With the FLOW 6.1 case, you can build high-hash, great cooling, and space efficient professional mining rigs for home or mining farms without wasting time or money. Package Contents:
1 x FLOW 6.1 Open Air Case (Requires Assembly - instructions included)
6 x PCI-E Riser cards
6 x USB 3.0 30cm cables
6 x SATA Power Cables
1 x Power Switch
All needed screws for attaching your hardware

List Price: $ 299.99 Price: $ 244.95