Allboutchickens.com will have them available for direct online sales soon. They have the best price. Their page isn't done yet, though. For now, you can get them on eBay. Here are two links:Can anyone give me a link to a place I can get the horizontal nipples?
http://www.ebay.com/itm/Side-mounte...826?pt=LH_DefaultDomain_0&hash=item2a2c32a852
http://www.ebay.com/itm/10-HORIZONT...054?pt=LH_DefaultDomain_0&hash=item338bfeed76