Set cooker to high and let sit for about 2-3 minutes. Add 1 jar of grape jelly and 14 ounces of Texas-style barbeque sauce into the cooker and mix well for about 30 seconds. Add bag of frozen meatballs and mix in with the grape jelly and barbeque sauce. Cover and let it sit on high for 2 to 3 hours, occasionally mixing. Set cooker to warm as you serve the meatballs. Serve with sandwich bread or a side salad. Serves 6-8.