Here you can purchase the best Devon Rex kittens from the best breeders. Every Devon Rex cat breed for sale we offer comes with a pedigree, vaccinations etc.Most of the cat breeds these days can be traced back to their regional origin. Being domesticated almost 1000 years ago, people are thought to have developed mutually beneficial relationships with cats as they are now more agricultural. Well, cats are prodigiously good at fending away rodents.