doing a little research on this...

Per Digikey:
DS3662N     16-DIP   Quad High Speed Trapezoid Bus          only in bulk of 150 @
$467.63US
DS8641N     16-DIP   High Speed w/Open-Collector Outputs    only in bulk of 400 @
$405.00US
DS8838N     16-DIP   High Speed w/Open-Collector Outputs    $2.64US each (1-24)

The DS8838N I grabbed from the schematic of Chuck Dickman's IDE to Qbus adaptor.
Considering the costs, and the fact that it seems to work, I would say that the DS8838 is
a viable alternative.

jam