I googled and found this site which does a taxi cab fare estimate. You enter the 2 addresses and it estimates the fare. I don't know about the closest walmart/grocery store but I would check citysearch.com for that information
In addition to the two Publix stores on 192 (the one Luv2Roam mentions and another just a bit farther down), there's a Walmart fairly close by, though I'm not sure of the exact mileage. Take 192 east to the end where it runs into I-27 and go north to the first stop light, Cagan Crossings (BP station on the corner). Turn right and the Walmart is behind the BP. There's a Winn-Dixie about another quarter mile up, too. About a 10 minute drive, depending on how many exhausted, lost tourists you end up behind
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