On a tangentially related topic, a very large number of TO-92 parts have been discontinued, and are (briefly) available for cheap on Arrow. I got a couple of thousand MBT5179s and a bunch of other stuff for one or two or three cents apiece, so that I can keep doing dead bug protos for the rest of my career. Other dead-bug fans might wish to take notice.
(2N3904s and 2N7000s will be available for a long time to come, I expect, but all the RF parts and are going away, as well as JFETs and small signal MOSFETs and such.)
Cheers
Phil Hobbs