Hainsey isn't getting dealt for a late round pick lol. Multiple insiders have said that they expect there to be interest around the deadline.
I would target Arizona, maybe for something around Lyubushkin and a mid/late rounder; Colorado; Edmonton, possibly in a deal for Matt Benning; Nashville, maybe in a deal around Steve Santini and a mid-rounder; Tampa Bay; Toronto; Vancouver; or Winnipeg.
I think there will be even more interest in Boro. If it's anything a 3rd rounder or better, and if he wants any more than 3yrs x 1.3mil, I hope they move him. Interest would be massive in Boro, imo, as well as DeMelo (who I would happily retain, but only at the right price). Ultimately, if we're not re-signing either of these guys, it might make sense to hold onto Hainsey unless we return DMen/a DMan in a trade.