I was in a similar situation at my local CVS. Great looking girl, again kept catching her eye and what not, when I finally got the marbles to say something to her.
I went up to her as smooth and as confident as could be and laid a corky line on her:
"I've got some meat here that's 'Best if used by tonight"
Of course, we weren't in the frozen food isle or at the supermarket (that's the corky part

) and she was shopping for a bereavement card as her grandfather had just died.
All in all it would have went really well, I got a smile out of her, the timing was just....off. I have to say using these off lines has worked for me on numerous occasions.