For a quality non-back yard breeder pup that is NOT from a puppy mill you should be paying around $2000-$2500, show quality is $3000 and up.
If this is way out of your price range, I would suggest adopting one. There are tons who need homes listed right here on the site. This could give you some experience with having a bulldog while you save for one (if you don't have $2000 to spend right now, that is). Plus the adults are so wonderful, and you will already know what, if any, health issues they have.
Plus I just like them when they are older and even more lazy and snuggly