Be careful when searching on Amazon or Etsy. Many listings for "Peony Seeds" are actually for ( Papaver paeoniflorum ).

If you see a packet of 1,000 "peony" seeds for $5, it is almost certainly a poppy. 💡 Pro-Tips for Buying Red Peony Flower Seeds - Outsidepride.com

If you are looking for true or hybrid seeds, these are the most trusted sources: