Some recent Bitcoin mining rigs auctions on eBay:

CoinDriller2.0 Zcash BitCoin Gold Cryptocurrency GPU Mining Rig 3xGTX1080TI
$4,999.00
End Date: Friday Feb-9-2018 9:19:32 PST
Buy It Now for only: $4,999.00
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5 Vega 64 GPU mining rig Monero 10,100 H/s assembled (Bitcoin Crypto coin) XMR
$13,000.00
End Date: Sunday Feb-18-2018 7:31:42 PST
Buy It Now for only: $13,000.00
Buy It Now | Add to watch list