I know around here you see the calves being pulled in the small and not so small operations to optimize milk production. Young kids are bottle raised by Amish with milk goat dairies. I have been to one at feeding time where there are pens set up in pole barns, each pen housing 5 or 6 kids in it. They were so cute. If you stuck your hand in the pen you instantly had a kid latch on to a finger and suck like crazy. I had one on each finger with another trying to butt a did away so it could claim a digit. A heifer calf left to nurse on momma is going to take milk away from the dairy profit. Cheaper to bottle feed it on formula.My thought is there probably just aren't any available. I don't see why someone would pull a heifer calf off momma and sell it as a bottle baby. That's probably the most desired calf out there. I think you'd do much better looking for a weaned or older calf. Plus, bottle babies don't always turn out so well.
There is a farm near us that just put up a feed lot filled with young dairy steers. Not a very good life nor a very good end for them.