What about Wil Myers as a trade candidate?
He's dirt cheap the next 2 years, so 2020 might be the time SD looks to trade him, but he hit 30 HRs last year playing half his games in SD.
Contract: $14M luxury tax cost
6 years/$83M (2017-22), plus 2023 club option
signed extension with San Diego 1/17/17 (avoided arbitration, $4M-$3.4M)
$15M signing bonus
17:$2M, 18:$2M, 19:$3M, 20:$20M, 21:$20M, 22:$20M, 23:$20M club option ($1M buyout)