ISO dairy-free pie
I don't know for certain they have them, you could call and check, but you might try the Kosher Deli at HEB on Far West Blvd.
Kashrut law forbids eating meat and dairy together, so Jews who keep kosher and plan to eat turkey, cannot eat desserts with dairy. They MAY do a dairy-free pumpkin pie there. They're certain to do other types of dairy-free desserts.