Cavallo,
Yes Pr Peace is hard to find.
In Apr this year, Joan Monteith sold a couple suckers for $5 ea plus postage (U.S. only). Contact her; she may be able to provide a plant.
Go to rosehybridizers.org; search their forum for prairie peace; the name of the post is 'prairie peace and ross rambler suckers.'
Good luck,
dave

Here is a link that might be useful: rose hybridizers association

Well, I had emailed her before posting here. Still no reply. I'll just have to throw myself on the mercy of the web, and hope someone out there with PP sees this.