How much does bull sperm cost?

You get the sperm by the straw. And the amount per straw depends on the quality of the bull, how large the demand is for that bull as well as the breed of such a bull. Prices for semen straws can sky rocket if the bull dies and there is only a limited quantity of semen left. You will have to check your local bull semen distributor or any other cattle ranches that sell bull semen for their prices.