I got mine a couple of years ago. Didn't have a boa yet, but wanted to read that book before choosing one.
I'll be curious to see if demand outpaces the used supply for this book. I buy a lot of out of print books on-line, and titles that were once very costly have become affordable again. Recently, I've been getting copies in "very good condition" of just about anything I want for between $20 and $50.
That, however, is the textile scene - probably more people are ageing out of the crafts than entering. Don't know if the potential audience for the most well regarded book on boas is growing or shrinking.