International Stone Quarries Clearwater International Stone Quarries is located on the edge of Clearwater and Largo. They are located just north of the intersection of Bryan's Dairy Road and on 49th just behind local barbecue joint Poppa's. When you go to visit ISQ to select your slab make sure you stop into Poppa's BBQ for their lunch special. Get their early before its gone. $7.95 includes a BBQ sandwich with a side of ribs and a drink.