Put your prepared roast and a 12 oz. can of beef broth in your slow cooker, and cook for 8-10 hours on low, or 4-6 hours on high. This seriously has to be the best Italian beef I have ever had.
Meat: $6-8 for 3-4 lbs. @ $1.99/lb
Parmesan Cheese: $.05 for 2 tsp.
Salt: $.02 for 2 tsp.
Garlic: $.09 for 2 tsp. minced
Beef Broth: $.35
Oregano: $.08 for 1 tbsp. oregano
Total Cost: $6.59 for 3 lb. roast + additional cost of buns