The jorts were being sold on Farfetch for a whopping $1,213 but were 50% off the night of the game -- but it's all sold out as of Monday morning.
Shouldn't come as a total shock ... millions had their eyes on Taylor during the Chiefs vs. Jets game, with NBC's 'SNF' leaning hard on her viral craze that went down just a week before, and cutting to her a lot throughout the game.
This isn't the only Swift/Kelce clothing choice to run out -- as we reported, a fashion line added "1989" to the name of the jacket Travis wore last week when he was spotted walking out with Taylor, a reference to one of her albums.
That one sold out incredibly fast, too ... so it looks like the 2 will be picking their outfits wisely from now on -- either that, or brands will be reaching out like crazy to get them to put on their threads!
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