Depends on where you live and the prices themselves. Dairy bull calves will not cost much; maybe $150-$200. You won't find beef bull calves for sale. Make sure you castrate them as soon as possible so you don't have a trainwreck when they get older.
Bull calves.
There is no such thing. Bull calves are male, never either male or female. Female calves are called heifer calves.
Bull calves, steer calves, cows and heifers.
Yes.
A young bull is a bull that is often younger than one year of age, but too old to be still considered a bull calf. Bull calves are no longer known as bull calves after 10 to 12 months of age.
Baby calves.
Bull calves are altered or castrated, at which time they are called steers. Steering a bull prevents fighting, accidental breeding with cows and heifer calves, and allows for easier management.
50% of the calf traits come from the Bull.
The cow.
This depends on the breeder and your area. Some Dexter breeders may sell for more than others, depending on the quality of the bull.
Mutton is meat from sheep. Veal is meat from calves, particularly dairy bull calves.