OK, for instance try to find a CMOS 74150 or 74147. Both are available only in the obsolete 7400 TTL family (slow, large package, awful noise immunity and power hungry). The first is a 16:1 multiplexer and the second is a 10-line to BCD priority encoder. Digikey will sell you the 74150 for $4.56 and only grey-market distributors have the 74147 for $2. Both are devices I actually used way back when.

My only point is these devices and many, many others are no longer supported (no CMOS versions) and are extremely expensive given the design alternatives available.

Mariss