I'm talking to someone off Craigslist about buying their 2 Pekin ducks. She says they are a sexed pair and are 14 months old. Here's the ad: "2 white pekin ducks. Donald and Daisy. She does lay eggs and are able to eat if picked and refridgraded daily. Approx 14 months old. Do not bite. Askin a rehoming of $30 will include nesting food and wadding pool. There poop is great for the grass. Free roaming also eats bug. Very cool pets. I'm just too wore out to do it any more. Plz contact me or my husband at * will be able to send pix on request" She even said she would deliver them, but I'm not sure if for a cost or not. So my questions, she's asking $30, is that a reasonable price? How long will a 50 pound bag of food last me with 2 ducks, if not free ranging? How long would I need to keep them in a pen before being able to free range them? What type of feed do they need at this age?