Yes, we do carry a Single size and a Double size mattress.
At Endy, we call a Single mattress a Twin mattress, with the same dimensions of 39 inches wide and 75 inches long. We call a Double mattress a Full mattress, with the same dimensions of 54 inches wide and 75 inches long. This is standard mattress sizing for North America.
Rest assured, if you are looking for a Single or Double mattress size, you have come to the right place.