Handywoman has a good suggestion going to Lowe's or Home Depot. I believe they offer a 1 year guarantee on their plants as long as you keep the receipt. Do you know what zone you're in? Peonies are a beautiful plant for northern zones. It is also a great time to plant bulbs for a spring bloom. It is best to get them in the ground before the first frost. Make sure you check the plant description to make sure you are planting it in the right location (i.e. full sun, part shade ect).
I hope that helps