Where is the best place to adopt an English Mastiff pup?

Most breeds have rescue groups from which you can adopt. but it is doubtful they would ship the dog anywhere. Many animals are mistreated and abused which is how they ended up in rescue groups in the first place, so it's the groups responsibility to see that their dogs have the best possible home they could get. If you weren't so specific in your requirements for this particular breed, there are literly millions of dogs and pups waiting every day in the pound and shelters. It's not their fault that they are there..it's the people's fault that owned them previously most of the time. So I always advise when looking for a new best friend, check your own shelters.