I see a few of the vintage race bikes from the '70's-'80's running Astralites in the VRRA, they are very highly thought of and sought after; every now and then a set comes up for sale, they always sell quickly and never cheaply (iirc 1500-2000? Canadian funds) fwiw.
I think over the years, because racers are willing to pay the money for lighter wheels, most of them have ended up on race bikes or in that group of owners; if you really wanted a set, sales groups dedicated to the race crowd would be a good spot to start.
good luck
Kelly