Was it COWS or bull calves...?
Those are generally sold hours to days old, having gotten little or no colostrum, with a high mortality rate...but yeah, they're cheap.
In fact, MOST animals from auctions have a much higher mortality rate than from a breeder.
Heifer calves tend to be free martins...so if you got a heifer calf for cheap, you may not have gotten such a 'bargain'.
If you really want goats, get them from a breeder.
Goats at auction are there for a reason...generally NOT a good one.