My SIL wants to buy my Ergo, and I'm not sure how much it's worth. And am on vacation, so don't have access to my password, etc for the babywearing boards (now I even forget what they're called!). I bought it new in 2005, so I know there's at least one newer version by now, maybe more. It was lightly used, prob washed once, and is in great shape. Is $50 fair? Don't want to ask too much from a family member, but don't want to ask too little either.