After a long search of the peony stamp last year, I finally went ahead and made the stamp locally in Office2000 (stationery and office supplies store).
Actually, I think any places that accept to make customized stamps will do and I had made mine for $5 for 8cm peony image.
Susan, aka Mrs Ladybug, was kind enough to reply to my request of where she had made her stamp. US readers, please visit Stampworx 2000.
Image source Stampworx 2000