​The Mets have fascinating decisions to make before Monday’s trade deadline. New York is a seller, which means it has a handful of veterans who are going to be moved. Sprinkled throughout their roster, however, are several valuable pieces with team control extending beyond this year. With interest in some of those players percolating, the Mets need to find the right balance between keeping talented pieces to try to contend next year and getting more valuable assets back from a contender making a buy-now push.To get a better sense of who is already packing their bags and who is untouchable in those trade talks, we split 27 players from the Mets’ 40-man roster into seven tiers. They’re listed here from most likely to be traded to least likely.IT’S ONLY A MATTER OF TIMELHP A.J. MinterRHP Freddy PeraltaLHP Brooks RaleyOF Tyrone TaylorThere’s nothing to debate here. All four of these players are on expiring contracts — they will enter free agency after this season — and with the Mets no longer contending, New York will trade them away. Minter and Raley can help a contender bolster the back of its bullpen with an experienced left-handed reliever who thrives in high-leverage spots. Taylor, a right-handed hitter, has been on fire recently at the plate, and he has a track record of quality defense in the outfield. Even with Peralta’s disastrous season in a Mets uniform, the Mets can cash in on the market for starting pitching. Teams are already lining up to get a shot at bringing out the best in Peralta down the stretch.IT WOULD BE A SURPRISE IF THEY’RE NOT DEALTRHP Clay HolmesOF Luis Robert Jr.Both Holmes and Robert are likely to be traded, but there’s still a slim chance they stick around. It’s very slim, but it exists.For Holmes, the Mets still have time to talk about an extension. It doesn’t sound like they’ve made too much progress on that front, though. If there’s no extension, the Mets must move Holmes because he’s sure to decline his $12 million player option for next year and test the free agent market this winter. That makes him essentially a rental, just like the four veterans in the previous tier.Robert, meanwhile, can be under team control next year. He has a club option for $20 million to stay in a Mets uniform for 2027. Since returning from the injured list, Robert has had three hits in 24 plate appearances, including two home runs. It wouldn’t make much sense at all at this point to keep Robert, though. He gets hurt every year, and the Mets’ outfield is full for next year and beyond. More on those “untouchables” later…FOR THE RIGHT PRICEIF/OF Brett BatyRHP Huascar Brazobán LHP Sean ManaeaC Luis Torrens1B/DH Mark Vientos RHP Luke Weaver 1B/OF Jared YoungThe Mets can go into the deadline with a steep asking price for all of these players, especially Weaver and Torrens, due to the widespread interest in relievers and catchers. Weaver is intriguing because of his dominance (1.93 ERA), his ability to pitc