The Sacrifice Theory promo tape is the one with a Vandals song from Look What I Almost Stepped In on the other side, right?
The postcards for these were at Warped Tour in summer 2000. I don't recall how many dates the Vandals were on that year, but AFI did about a week or so. It included Cleveland and Pittsburgh. The postcards were at their merch table. There may have also been a Nitro tent or table or something that had them.
Here's a fun wild goose chase for you guys from that same era. So The Art of Drowning leaked pretty far in advance of its release date, with Napster really blowing up that summer. I'd say it was floating around in late July or early August, if not before that. But, even before that, decent quality rips of Sacrifice Theory and Wester popped up. Is it just a coincidence that these two songs spread first, or is there some kind of promo disc or something that someone ripped? I always wondered that.