I got some playsilks and acid dyes in the last Dharma co-op. I did not buy any Synthropol because I figured I'd buy it locally rather than paying for the shipping on something that heavy. I've been to Joann's, Michaels and a local quilt shop and none of them have Synthropol.
I've read all the threads I could find about dyeing. There are definitely people using vinegar to set dyes, but it seems they are using Koolaid or Wiltons food coloring rather than the commercial acid dyes. Is it possible to use vinegar rather than Synthropol with the commercial acid dyes? How does this work?