Newfypoos are not a very well known dog breed which can make them a difficult breed to find. It is unlikely that you will stumble across a newfoundland poodle mix for sale in pet stores, local rescues, or in classified ads since these places generally cater to more popular dog breeds. The most likely places you will find a newfypoo include a breeder or a poodle/newfoundland rescue.
The newfypoo's rareness may actually be a good thing for many owners. Rare dog breeds don't risk being over-bred for profit which is a common issue with popular dog breeds. This means breeders will likely be experienced with newfypoos as well as Newfoundlands and Poodles and will be able to raise the offspring to preserve the breed's spirit and personality.