I have gone and bought different things than what I ordered.Go early and you will have a good chance of getting all you need.
You can do both, call them
Cut off to order online was Thursday. They usually have extras. I'd drop by and check to see if they have what you need .
They don't usually take orders this late. But, you can go there and see if they have extra or cancellations.
You can place it on line or show up see if they have what you need
You can do it on line. Or show up and see what they have
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