Del. Code tit. 11 § 1117
A person engaged in the sale or distribution of tobacco products or tobacco substitutes shall post conspicuously at each point of purchase and each tobacco vending machine a notice stating that selling tobacco products or tobacco substitutes to anyone under 21 years of age is illegal, that the purchase of tobacco products or tobacco substitutes by anyone under 21 years of age is illegal and that a violator is subject to fines. The notice shall also state that all persons selling tobacco products or tobacco substitutes are required, under law, to check the proof of age of any purchaser of tobacco products or tobacco substitutes under the age of 30 years. The notice shall include a toll-free telephone number to the Department of Safety and Homeland Security for persons to report unlawful sales of tobacco products or tobacco substitutes. The owners of an establishment who fail to post a notice in compliance with this section shall be subject to a fine of $100.
11 Del. C. § 1117