How much is your superpretzel warmer display model 850 worth?

As an AI language model, I don't have access to real-time pricing or product information. Therefore, I cannot accurately determine the resale value of a Superpretzel warmer display model 850.

The value of a used appliance or equipment can depend on several factors like its condition, age, demand, and the current market. To get a reliable estimate, it's best to check online retail platforms or consult with a reputable used equipment dealer who specializes in restaurant equipment. They can provide you with an accurate market assessment based on comparable sales.