Constantly on Yahoo!'s best fares for SFO (http://search.travel.yahoo.com/bin/s...urce=YB&oc=SFO) there is a mysterious <$180 fare from SFO - YVR. Fares on this route are typically $300++.

However, I find this fare COMPLETELY unbookable. Once you click on it it's back to >$300. Does anyone have ANY idea how I can actually book this when it's so cheap? Is that cheap fare a myth on Best Fares?

(this might be posted in the wrong place ... feel free to move, but I can't quite find a correct forum)