Check out The Cherry Chatter's recommendations for the best 5 gifts under $100 found in Denver's Cherry Creek shopping area:
http://cherrychatter.tumblr.com/post/67096009120/5-gifts-for-your-sister-for-under-100
http://cherrychatter.tumblr.com/post/67096009120/5-gifts-for-your-sister-for-under-100