If the breeder says the pups are imports, RUN DONT WALK!!!! Check out bullynet, but I would STRONGLY advise buying from a breeder who shows - the health differences between a well bred and poorly bred bulldog can be much more extreme than other breeds.
I own a bulldog, a well bred one from a VERY reputable breeder - hes on our site.
DO YOUR RESEARCH - and take your time! Don't skimp on purchase price, as I guarantee you will pay it out in vet bills on the lower priced puppy in the long run.