The bookstore hours listed online are incorrect. They are, in fact, open on Saturdays. No one could confirm the exact hours though. I’d suggest just calling them before heading to campus. That’s what I did before the Red/White Scrimmage the other day.
Now the Team Store not being open on Game Day is beyond dumb. We stop there often before games and it usually has a good crowd, much bigger than little kiosks inside the stadium. I really wish they could put something similar in size to the UC Bookstore near TDECU and Fertitta. It’s the only campus shop with nice stuff like Peter Millar, Coog-branded Yeti’s, etc. The stuff inside the stadiums is usually trash.