Their website states they do not ship outside of Europe. The only way any varieties they've hybridized could be made available here would be if a grower would visit them and bring back a plant or budwood.
Like those from many North American nurseries, some of their roses are bought or licensed varieties such as Grandpa Dickson, a Dickson rose from Ireland. It's pictured on their on-line catalogue page, is also known and registered as Irish Gold and is licensed by J&P.

Most of their roses are never picked up by nurseries in North America. They always sound interesting, and their business seems to be growing, but someone like Pickering, Hortico or Heirloom would have to decide to sell some of them for us to be able to get them.