There are always listings on ebay and you usually don't have to spend more than ten bucks. Ten bucks well spent. The film is readily available for most models, this site gives a run down of which ones. The process of taking the pictures, waiting for the timer, and peeling back the paper to reveal the image is deeply satisfying and the photo quality itself is undeniably beautiful.
Your land camera will be a welcome accompaniment on any outing on a sunny day, giving you and your friends and families priceless photographs with all the quirks and beauty of an old polaroid.