See if you can flip them, I am sure someone is willing to mine at a loss there, plenty of people are here.
I actually did have some success selling some unprofitable miners but only during a bull market. During a bear market or sideways market like we have now its difficult.
Basically these were old Antminer S1,S2,S3 and were all unprofitable and basically I Craiglisted them for like $50 and I put a disclaimer out there, they aren't profitable due to electricity costs and are only good for getting a head start in mining. Durin the bear/sideways markets they didn't get a single inquiry.
Then when the bull market craze came back I listed them again and people were buying them like crazy, even though I explicity told them they won't make money. They didn't care and wanted it anyways.
So maybe wait until BTC breaks $20K and sell it then for $50 on Craiglist.