Giardetti, a Retailer, Placed an Advertisement in a Local Newspaper

Giardetti, a retailer, placed an advertisement in a local newspaper on May 5^th that read: "Special Sale! New 16" portable TV set available for sale to the first 10 customers at my store on May 10^th at a sale price of $100 each. Regular price $199. First come, first served!" Don was the 10^th customer in the store on May 10^th, but Giardetti refused to sell him a TV set for $100. If Don had seen the notice on the shop door on May 9^th; he could still accept the offer, because the offer was irrevocable.