I am not sure at this price, any responsible breeder will sell you any dobe pup. BEWARE OF PUPPY MILLS!!!!!!!!!!!!! Any pet quality dobe pup will cost atleat 8k+. Also, cost of raising a large breed dog is huge and you will have to look after its food, medical and other costs. Better look out for any animal shelter or dog rescue center and adopt one.
Think again before bringing a pup home (not important you buy it or adopt it), beacause its a commitment of 10 to 15 years.