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Amazon.com: NutriChef Portable Electric Food Hot Plate-Stainless Steel Warming Tray&Dish Warmer with Black Glass Top-Keep Food Warm for Buffets,Restaurants,Parties&Home Dinners-22' x 6'-Heats up to 203°F: Home & Kitchen
VTG Microwavable Hot Plate Thermal Insulating Stone Keeps Food Hot Handles Cool | eBay
Amazon.com: Food Warming Tray Electric Food Warmer Plate Intelligent Insulation Food Warmer Serving Tray Multifunction Keeps Food Hot Suitable for Party Activities and Family Dinners : Home & Kitchen
Micro hot plate thermal insulating Stone keeps food hot great for outdoors | eBay
How Long Does a Thermos Keep Food Hot? Comparison | MOMables
Other than convenience store oden and pizza delivery-- "Food warmer plate" that eliminates the hassle of "warming with a microwave oven" [enuchi.com]