If you buy batteries, sunscreen, or any vacation like items at the Walgreens are they more expensive?

Might sound like a goofy question but in visiting some touristy areas we have noticed price increases on certain items. We are considering just doing "carry-on" on the cruise. The only reason that we would have to check luggage is due to liquid allowance.

Thanks in advance.
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March 21, 2011-Majesty of the Seas Mommy/Daughter 1st Cruise
October 2011-Carnival Imagination Mommy/Daughter Cruise
May 31, 2012-Carnival Ecstasy-Aunt's 1st Cruise
September 23, 2012-Carnival Conquest-Divas and Dons
February 21, 2013-Carnival Ecstasy-Girls Day Out
September 2, 2013- Imagination-Family Reunion Cruise
September 21, 2014-Carnival Valor-Divas and Dons

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