If you want something for sale, a year or two ago I picked up a plain gray sweater from the Gap for like $16 bucks on sale. It was a good deal, but I work at Farinelli's and compared to the Buzz Rickson four-needle sweater that we carry the quality on mine is really garbage. When you think about it, a plain gray sweater is a timeless piece. It's never going to go out of style. Like a good pair of jeans, I think you can justify paying $100+ for one that is of high quality because you're going to wear it hundreds of times over several years. Good luck though.