A person may need to call/check around to inquire if they're available anywhere or if they were a special order.
I didn't see them for sale on the Black Fives Foundation website, but maybe they know more about them.
I noticed that the shirts said B5 on them which could indicate the Black Fives Foundation. and they're also associated with Puma.
The foundation has a contact page with their info.
How to contact The Black Fives Foundation.
www.blackfives.org
Or maybe the Official UConn Huskies Fan Shop has info. through their contact page.
shop.uconnhuskies.com