Any small grain cut in boot will test high in CP.  Maybe not so much bypass.  Hands down the cheapest protein of all is urea.  Learn how to feed it and you can save a lot.  Do it wrong and you can kill a lot of calves.  Find some damaged wheat that someone wants out of the bin and feed it in small amounts.  Wet brewers is a nuisance to handle, but sometimes it's a good buy.