Identifying Irony in Lisa's Statement

Lisa had been saving for months to buy her dream bicycle. One day, as she was walking home from school, she spotted a shiny new bicycle in a shop window. Excitedly, she rushed to the store, but her heart sank when she saw the price tag—it was far beyond her budget. Disheartened, she muttered to herself, 'Of course, just my luck! After all, who doesn't dream of spending their entire savings on something they can't afford?' In this passage, what kind of irony is being demonstrated by Lisa's statement?