Got this Weber Summit 450 for free. Turns out it's natural gas and I want to sell it. How much is a decent price on this? (Or can it concert cheaply to
Weber 7270001 Summit S-470 4-Burner Natural Gas Grill, Stainless Steel
9MM Cooking Grates for Weber Summit 400 Series Summit E/S 450/440/460/470, 67550 | eBay
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Weber Summit S-660 6-Burner Built-In Propane Gas Grill in Stainless Steel with grill cover and Built-In Thermometer 7360001 - The Home Depot