Frozen store-bought pie crust
Generally, pumpkin pie is made in an unbaked crust. So just pull your frozen shell out of the freezer and let it come to room temperature before filling, and bake it per your recipe.

EDIT: I looked at a few recipes, and some do call for prebaking the crust, so let the recipe be your guide. The most common recipe, the one from back of the most popular brand of canned pumpkin, calls for filling the unbaked shell.