STOCKTON — A new 7-Eleven convenience store and gas station opened Friday at 121 S. Center St., the site of the former Greyhound depot across from the Stockton Police Department. Opening day specials included $3.69 gas and free drinks including Slurpees and coffee, plus 5-cent pizza and $1 hot dogs.The former site of the Greyhound bus depot was demolished in early August and the new development, Stockton Crossroads, is taking shape.