Score!! Head over to Walmart and get this Blackstone Duo 17″ Griddle and Charcoal Grill Combo for Only $159 Shipped! (Reg. $200). The Blackstone Duo Griddle and Charcoal Grill Combo is the ideal for a complete outdoor cooking experience. Cook up your veggies on the griddle, while you grill your patties for that savory charcoal flavor. The charcoal grill and griddle combo has an adjustable H-style stainless steel burner with an output of 12,000 BTU. It also has a side shelf to support a propane tank and prep space. This model includes an automatic igniter and a rear grease management system for the griddle top.