All the above prices seem fair. I have seen goats much lower and much higher. It depends on the quality of the animal and how anxious (or not) the owner is to get rid of them. I have had goats given to me, and I have bought goats that I later found out were worth more than I actually paid for them. I have also bought goats that I was later disappointed in. Dairy goats should be of good health, tameness, and good udder or, if a doeling or buck then from excellent milking lines (an see their mother's udder is possible). Meat goats should be healthy and of course "beefy". Avoid horned goats. They will constantly hang up in the fence. Yippee if you find a naturally polled doe (which should not cost more). She will throw occasional polled (hornless) kids. But never breed a polled buck to a polled doe or nasty genetic defects and/or death happen to the kids.