I plan to visit family, any souvenir shops? Do they even exist?

Born and raised inside Houston, recently I moved to Europe where my wife is from. I want to find a shop to buy souvenirs for her family when I come back. It’s kinda a tradition here, when someone goes to another country they’ll buy gifts or souvenirs. I know I can stop at bucees and I think there’s a store at the Mall called Texas. Any other ideas? Never really seen a souvenir shop even tho Houston is full of tourists.