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Have you tried Will McLewin of Phedar? Worth contacting him even if they are not listed on his website; http://www.phedar.com/catalog/(I've never even seen P. tenuifolia 'Alba' but my plant of tenuifolia 'Rosea' came from Will)
I have some P. wendelboi growing, but these are still very small first-year seedlings. If they grow well, you can pick one up here at the end of this year (it seems I'm only a few miles away from you). The other two I don't have. Regards,koen hurtekantWingene, Belgium
3 yr old seedlings about 30 euros: http://spezialplant.nu/produkt/paeonia-wendelboi/