What about the security cameras at the store?
I'd be far more worried about the credit card transaction and ISP log from buying this online than I would be about a camera in the grocery store. Of course you could TOR the browsing or use a library computer. And maybe eventually they'll add support for non credit card payments that can't be tracked. But throwing on a hat and some sunglasses and heading to your neighborhood 7-11 seems a lot easier (and cheaper).