Here is hope against hope that someone will have 10 74als125a smt that they need to part with. Barring that does anyone know of an IC sourcer that is willing to do small quantities of obsolete parts.
Will a different family do? There's an eBay seller who selling SOIC 74F125Ds. Somewhere in speed between AS and ALS (i.e. faster than ALS) with higher power consumption (but not as much as AS) and higher fanout than ALS.