I looked for a good Tomes or Daily Dice thread to drop this in, but they were mostly old. Then I looked through the Daily Dice Project (which was just Silver rolls anyhow) thread and saw that there were no recorded drops of a ToF there, so...
Just throwing this out there. Tomes of Fate are in the DD Gold treasure tables:
(...and of course I hit it on one of my lowbie alts on Wayfinder - where I'll NEVER make it to 20+)