If you don't want to go to an auction, ask at the feed store, your local large animal vet or farm store to see if anyone knows someone who has some calves for sale. You can also try posting a note on bullentin boards saying you want one. While your asking, ask about prices too so you don't get overcharged.
I'd sell you one, but I'm in Illinois. Probably not cost effective to go that far
Make sure your new calf has had it's shots, is castrated and de-horned (if needed) and has been weaned for at least 30 days. All that is not totally necessary, but it will help ensure that you get a nice healthy calf to start with and will help to avoid the expense of these things and illness due to stress.
If I am looking at calves, I look at them from behind. They should be thick through the rear, with their legs nice and straight under the corners of their bodies. The thickness should carry through their entire back. Calves whose legs are close together, with skinny rears, so not bring as much. From the side, they should be good-bodied....equal depth from shoulder to hip, without really long legs. Not much eating on legs!
Jena