Thank you for clarifying what the merchant should have done in this situation. Your recommendation makes sense. And while an apology and an explanation as to how the merchant's price doubled overnight would help, I question whether the merchant may have actually created a verbal contract when they gave me a verbal assurance that he could complete the awning construction / installation job as verbally described for $400 to $500, "Easy - No Problem" as he stated to me in person on the day he measured the installation space for dimensions. There was a meeting of the minds at that time as indicated by his verbal assurance of the price within the $400 to $500 range. Was that sufficient to constitute a verbal contract I could legally pursue for enforcement?