[sdiy] Cheap low input current opamps?

[David G Dixon]

Hey Team,

I'm looking for a cheap alternative to the LF442/LF444 opamps, which have
very decent input current specs and therefore recommend themselves for use
as S&H buffers (typical offset current 5 pA, typical bias current 10 pA).
I'm coming up short with Google searches.  Does anyone here have any
suggestions?  The TL06X series is pretty good with typical bias current of
30 pA, but I'm not finding anything else that isn't much more expensive.