Today a good price for an 01A is about $14, maybe less, all thanks to Al Gore's internet. AND I won't even use an 01A because there are so many UX201s and CX301s available for not much more.
Ah, those were the days, before reproduction grill cloth. Kind of like today - AFTER (most) reproduction grill cloth. Still AES was a boon to most radio collectors, especially those located outside of the big cities.
Remember, any prices listed here are a LITTLE out of date. Here are some pages copied from the 1989, 1990 and 1991 AES catalogs.: