How much should expect to pay for a goat?

Excuse me, I'm interested in purchasing a goat, but I'm not sure how much I should be expecting to pay. Could you provide me with some insight on the average cost of a goat, and perhaps any factors that might affect the price? Is there a standard range that I should be looking at, or does it vary widely depending on breed, age, and other characteristics? Any information you can offer would be greatly appreciated.