Here is a report of Buffalo Hockey players arriving wearing 'LOVE FOR 3' shirts. The football game was last night. So, not even 24 hours goes by and T-Shirts are printed, shipped/picked-up and distributed quick enough to show support for Damar Hamlin.
Something seem off...
https://nypost.com/2023/01/03/bills-damar-hamlin-news-live-updates-after-cardiac-arrest/
There are many people who make T-shirts at home. Just need a computer, machine that cuts the PVC sheet and a heated press, makes it stick to the shirt.
I was looking in to a work from home option for a mentally challenged family member not long ago.
I have a friend who has a tee shirt store and she would drop them quick if the price was right. Takes nothing to make them on a computerized machine. Have them ready in an hour.