Those look nice and healthy. How much are 5-gallon pots in your area? Peonies are not grown that much here so it is difficult to find many available in the nurseries. Costco and Home depot has some, but just the common varieties. How many different varieties do you have now?
I always thought it is a shame to grow peonies in my backyard because hardly anyone ever goes there. I like them out in front where they can be enjoyed by everyone.
I have a vegetable bed out front too since that is the sunniest area in my suburban corner lot.