Need to find parts 82S23 / 74S188

[alan canning]

Anybody no where to score some Sig 82S23 / Nat 74S188 parts ? I've tried all
the usual suspects ( Ebay, local parts houses, Digikey, etc. ) with no joy.
I believe this part was used on old S100 boards.

Part also known as ( a.k.a. ) Fu 7111, AMD 27S18, MMI 6330, TI 18SA30 and
Harris 7602. Need this part to fix an old computer controlled RF Power
amplifier.

Thanks for any and all help.

Best regards, Steven