are you looking for roots or full plants? It might be a little late in the year, but you can get a bunch at widely disparate sources. If you're buying more than one, Eden Brothers sells groups of two at a cheaper price than you'd find at like Brecks or other places like that. I just got my Mrs FDR peonies from Easy To Grow Bulbs today. I'd say also check Brecks/Gurneys/Michigan Bulb; the best approach might be to look up peony bloom shapes you like, search for varieties in the colors you like, and then google the varieties. I've had a lot of luck doing a google image search for a specific variety and then beneath it it'll say in stock. Hope that helps!

There are some online growers, which none of the above mentioned places are, that still ship but for most the shipping season has past. The growers should open their websites for sales starting around Christmas. In many parts of the country including here have had their first snow.