People do let them go for around $300-$400, on ebay $400-$600. There almost on the edge of their life span so the ROI is long or not there at all. 1.6Th/sec @ 2000W means if you pay .09 per Kwh you will never get your money back out of them given current diff increases.
I would offer you about the same $300 and I will provide shipping labels is my best offer.
I am not hurting to get rid of these by no means and $300 is definitely not going to happen when they cost $849 if you buy them directly from CoinTerra. As for eBay, most of those people just want to get rid of their equipment. I am not eager, nor do I really need to get rid of these. I am trying to avoid the hassle of moving my mining farm, but I am not desperate to get rid of these. I would rather pay the little cost and just move these and keep them running. I am hashing away with 12 TH/s and my electric doesn't cost me over $500 a month. If someone is paying more than $0.06 per Kwh I would suggest finding a new electric company. This unit costs me about $120 a month in Electricity so someone should have their money back within 3-4 months and that doesn't count any increase in BTC price.