The custom shop has dropped BG42 as an option, replacing it with S30V. The SOG X42 is long out of production, with only old stock available ( there are some small ones available that I know of). The Sebenza would have to be used, or New old stock if you can find one. A.G.Russell currently has the Boker Helios sprint run of aluminium framed, liner lock BG42 bladed knives.
They are getting scarcer and scarcer. I have all except the sebenza and to me, the Spyderco is the best. The slimlock is beautiful, but too small. The Buck custom was the best of all as far as price, but alas, that's no more. Joe