I have two different types of peonies. The dark pink ones, I bought (don't laugh) in a box at Sams. There was five, bulbs/tubers in the box. They were like 10.00. The first season they didn't do anything. I didn't expect them too, but last year they bloomed. The plants were still small last year, but I believe this year they will really do well. These are pics from my Sams Peonies.
My others came from the yard next door. This was years ago, the house was going up for auction and they told me I could have all the plants I wanted. There were two light pinks, and I dug them up. Neither spring or fall, I didn't have a choice. I just took a chance, and kept an eye on them. They're huge. I don't have any pictures of them.