public List <ProductModel> SearchProductsList()
        {
            if (Price == 0 || ProductType == null)
            {
                return(null);
            }
            List <ProductModel> productsFromType = ProductProcessor.GetProductsByType(ProductType.Id);

            CalculateClassificationValue(productsFromType);
            return(RetrieveValidProducts(3, productsFromType));
        }