Seven Everyday Slings has a promo going for a free sling! All you pay is shipping and handling. Use the promo code "halloween".
From what I understand, they do these free slings a lot. I had my mom order me one for Christmas, so I don't have personal experience with them yet, but I have a friend who likes hers. FYI, a lot of the sizes and styles are back-ordered, but for free I'm willing to wait.