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For die-hard fans that logged countless hours in red, green, orange or blue seats at beloved Shea Stadium, or for anyone interested in owning a piece of baseball memorabilia – your time has come.

The Mets, soon to be retiring their first baseball home are moving across the street to play at the glitzy, brand-new and chock full of luxury boxes, Citi Field beginning next season – are offering memories for sale online, at a small cost beginning Aug. 25.

On sale exclusively at Mets.com/Shea, the Mets farewell tour begins in earnest at the end of the month when seats go on sale at 9 a.m. sharp for $869 a pair.

The limited inventory of seats will be sold on a first-come, first-served basis. Fans can be sure they are getting the genuine article because each seat pair will be authenticated by Major League Baseball’s Authentication Program and affixed with a tamper-proof hologram displaying a unique identification number.

Mets season ticket holders will get priority on the seats they sat in and have the opportunity to purchase their particular seats before the Aug. 25 general public sale.

The sale of other Shea memorabilia on Mets.com will expand to include seat backs and 45-inch sections of bench seating from Shea’s Left Field Picnic Area. Details regarding the sale of additional memorabilia will be announced later this season.

“Citi Field will serve as a fantastic new home for the Mets for decades to come, but fans will always remember Shea Stadium and its magical moments – from the Amazins’ World Series triumph in 1969 to Game 6 in ’86 to, hopefully, a long, sweet October in 2008,” Mayor Bloomberg said in a statement.

The seats at Shea Stadium are owned by the New York City Department of Parks and Recreation; other stadium memorabilia is owned by the Mets, including clubhouse items such as player lockers.

Through an agreement between the City and the team, the City will receive a majority of the proceeds of the sale of the entire collection of memorabilia. The Mets will donate their portion of proceeds to the Mets Foundation, which will distribute the funds to various charities. The City’s proceeds from the sale will be deposited into the City’s general fund.

The removal of Shea Stadium seating will take place within weeks of the Mets’ final home game, with the demolition of the stadium soon to follow. The metal seat frames date back to Shea’s opening season in 1964. The original 55,300 wooden seats and seat backs were removed prior to the 1980 season, when they were replaced with the seats in use today.