Dan's Small Parts and Kits carries the RCA 4013. I got mine originally from BG Micro,
where they were sold as house-marked 2N3866s (or something like that.) Dan also
has several various transistors similar to the 2SC2078 / 2SC1957, if not those exact
parts. It takes a bit of time to work through his catalog (including the specials page.)
He may also have the 3N3553?
The 2N2219 and 2N2222 are current standard general purpose transistors - lots of
folks carry those.
The 2N4427 is a bit less common, but current production is still available from a
number of sources including Mouser.http://www.danssmallpartsandkits.net/http://www.bgmicro.com/http://www.mouser.com/http://www.digikey.com/