Where has your son had luck Brandy?
My brother's closet. LOL!
My brother is shorter than he is and was also think at one point. He had the funds to put into clothes from department stores and passed them along. Now that my son has grown taller, I have been replacing jeans with finds from thrift stores. We have found a couple of fits from Sears and even Walmart as well.
It's just a constant hunt to get what he needs and at bargain prices.