For a pure bred dog, depending on the quality of the particular animal and its bloodline, I would pay up to 500-600. Generally, I do not care about the animal being show quality, so for a pet, I would not be likely to pay more than 300.
For a mixed breed dog (like a golden doodle, which is just a cute name someone made up for a mixed breed "designer" dog to make more money off crossbreeding and creating mutts in a world already overun with them to the point that millions must be killed in shelters), I would not pay anything more than the cost of the spay/neuter and shots that the adoption ground had invested in it. More likely, I would find one for free so I could rescue it from getting killed on the street or taken to a shelter.