Two good concealed carry knives, IMHO, are the Bowen Belt Knife and the Puma Medici Stiletto. Both are currently available on Ebay for about $150. I lost my Puma many years ago, but still have my Bowen, although the belt is too snug. With a little work and practice the Puma can be reliably flicked out one handed. I carry a dollar Chinese all stainless about 2" long that the authorities won't allow in a courthouse or federal building, but otherwise don't object to. It will shave when recently sharpened.