no experience with looking for a gluten-free one...but had to ck out this post b/c my grandma always made mincemeat pie for x-mas. and we all used to joke about the poor minces that were killed for her pies

anywho, couldn't you just make your own w/ ingredients like below? not sure where you buy beef suet, but since its just fat, i would think it should be gluten-free...unless manufacturers include additives. guess i'm not much help...but never noticed mincemeat in store. i saw it once at a country store--had been canned and processed by a local farm.
1-1/4 pounds lean beef stew meat
2-3/4 pounds Granny Smith apples, cored and chopped
1/3 pound beef suet, coarsely ground
3/4 pounds dark raisins
1/2 pound dark brown sugar
1/2 cup white vinegar
1/4 cup molasses
1/2 pound currants
1/2 cup apple juice
3/4 teaspoons ground cloves
3/4 teaspoons ground nutmeg
3/4 teaspoons ground allspice
3/4 teaspoons ground cinnamon
1/2 cup bourbon or rum, divided