How much should i sell my german shepherd x rottweiler pups for?

The pregnancy was accidental, i moved up to qld to be with my sister and a few days after i got here my 1 year old german shepherd came on heat so i did not get the chance to have her deed. we tried to keep them away from each other by blocking my dog alora down the side of the house but overnight Boris my sisters rotweiler got in there and got to her. i am uming she is pregnant because from what i have read she is showing all the symptoms. i want the puppies to go to responsible people who are going to treat them with respect so i am not giving them away cos this will cause people to get a dog just cos it is free. what do you think is a fair price that will attract the right sort of interest?