Last Friday, the Mets had auctioned off the 9/11 jerseys they wore

J.C. Martin #9 - White Pinstripe Jersey - 50th Anniversary of the 1969 Mets - Worn On-Field during the Pre-Game Ceremony - 6/29/2019

Mike Piazza Comments on Mets Auctioning Jersey Worn After 9/11, News, Scores, Highlights, Stats, and Rumors

If the Mets are willing to sell Mike Piazza's 9/11 jersey, here are 15 more Amazin' things they should sell off – New York Daily News

Post-9/11 Piazza Mets Jersey on Display at 9/11 Memorial Museum

Jacob deGrom #48 - Autographed Team Issued First Responder Hat and Team Issued White Commemorative Jersey with American Flag Patch - Mets vs. Yankees - 9/11/2021

Mets, Yankees, MLB to Mark 9/11 20th Anniversary with On-Uniform Tributes – SportsLogos.Net News

When the Mets revealed these jerseys for last year's 9/11 game, I knew I had to get one. They were only made for the players, so there were no retail options available.

When the Mets revealed these jerseys for last year's 9/11 game, I knew I had to get one. They were only made for the players, so there were no retail options available.

Mike Piazza's jersey to be sold to investors who plan public display

Mets, Yankees, MLB to Mark 9/11 20th Anniversary with On-Uniform Tributes – SportsLogos.Net News