Chalk up a second deal alert for Saturday morning as the Samsung Galaxy S III gets a price drop good through at least July 17th at Costco. All Classic plan customers, both new and existing can take advantage of the $199.99 price drop for the Galaxy S III, though we’re not sure what colors Costco has stocked for T-Mobile. The Galaxy S III needs no introduction around these parts, and I’d act quickly before this deal ends.