PHOENIX — Do something, Mets.

The offense continues to be nowhere to be found and on Saturday night, and the Mets paid the price again, suffering a soul-crushing 2-1 loss to the Diamondbacks at Chase Field.

A win would have put them back in first place but instead, they remain a half-game behind the slumping Nationals.

Several scouts I talked to Saturday all had the same reaction.

Why don’t the Mets trade for some help? Any help?

“How could they just sit back and do nothing,’’ one scout said before the Mets’ offense went limp and put up one run.

That came on a home run by Juan Lagares in the second.

From that point on, Bartolo Colon was walking a tightrope. In the bottom of the seventh, he gave up a two-out bullet single to left Chris Owings. That was only the Diamondbacks’ fourth hit against Colon, who was doing it all, including his own base hit in the fifth.

Wellington Castillo — a light-hitting (.163) catcher, who just came over from the Mariners, another team with offensive woes — then crushed a two-run home run to left to put the Diamondbacks ahead, 2-1.

But it’s the Mets’ offense that truly is the culprit. They are 22nd in average at .242 and 28th in slugging percentage at .368.

Manager Terry Collins started a lineup that had Danny Muno batting sixth. Enough said.

After his homer, Lagares singled in the fourth. But with two runners on in the sixth, he flew out to center.

In that inning the Mets managed three singles, Muno got the third, but the hit didn’t make it through the infield, so Ruben Tejada had to stop at third base.

The threat ended when Eric Campbell, who had two hits and still is batting just .188, flied to right.

In the eighth, the Mets got a one-out single by Michael Cuddyer, his second hit of the night, but Lagares bounced into a double play, one of four double plays the Mets hit into in the game.

One name floating around that seems to be the most interesting is the Athletics’ Ben Zobrist. He would fit nicely into the Mets lineup in a number of ways and would give Collins some flexibility.

Imagine that.

But to get Zobrist, the Mets would have to outbid other teams and that is always a problem with the Mets, who want to hold onto every piece of young talent they have.

The Mets are targeting 2016 as their real target date to make a splash, but the opportunity is here in 2015. The Nationals are slumping a bit and have issues with Stephen Strasburg, who has not returned to ace status, but the Mets continue to sit on their hands in the trade department.

“There are so many things the Mets could do,’’ the scout said. “It’s just a question of getting a number from ownership, how much they can spend and then work with that number.’’

How much financial freedom general manager Sandy Alderson has, if any, remains to be seen.

Brewers third baseman Aramis Ramirez, 37, also is someone they are looking at, but as one Mets official said, “He is retiring at the end of the season, and is not playing all that well. It’s hard to turn it on after you turn it off in this league.’’

The Mets are looking to turn on the offense any way they can. This is a shame to waste all this good pitching, especially now that the Mets are going to stick with the five-man rotation and count on the young arms.

The pitching has been there for the Mets, who are fifth in the majors with a 3.42 ERA.

But what’s the sense of having those arms with no help from the offense? David Wright’s back injury was a terrible blow, but the Mets need to adjust their thinking, get some offense, even take a shot on a player who may be deemed to be washed up, do something.

Look what the Giants did in 2012 with the likes of Marco Scutaro or in 2010 when Cody Ross jump-started their offense. The Giants had tremendous pitching, decided to go for it and have won three World Series in the last five years.

This is a waste of a golden opportunity. Do something, Mets.