I remember one of the mail order shops that had full page ads in MBA in the mid 90s had an American Be brake booster listed at $999. It was stupid light, like 3-4 grams. Whether it was actually in stock is another matter.
The bike at this link was shown at the 92 Interbike trade show and was the first "B" bike shown. Produced by American Bicycle Manufacturing in St Cloud, MN.