Glad the undies are working for you. What size is your chest and neck? Just from your height and weight, a large maybe a little too small. What brands do you wear a large in? We don't stock XLs because we don't sell many. I know someone else may be interested in XLs, so maybe in the future we will make a couple and see what happens. These shirts are meant to be worn untucked and would be too short to tuck in. And no, we don't offer bulk discounts.