The best option in the OF is if the White Sox continue to falter and become sellers. If they put Luis Robert out there then I would have to think about something like a Frelick++++ deal. This would move Wiemer from CF to RF at a somewhat of a cost at defense in CF.
I think Laureano will be expensive as there will be other teams like the Yankees looking to get someone like him. If the Cardinals continue to struggle and O'Neil comes back and is healthy then I think there is a fit there and the Yankees go for him instead of Laureano but that will cost them more.
For Laureano you are looking at a Gasser+ type of a deal. I don't think Laureano would be worth that. I think he turns into a Schoop type of a trade.
Lane Thomas is probably an easier get from the Nationals. Thomas vs LHP: .360/.422/.627.
Another option against LHP would be Nick Senzel from the Reds who is hitting .455/.500/.659 against LHP. This maybe the hardest trade if no one in the NL Central is walking away with the division.
I think another SP is probably another need if Woodruff is not able to come back.