where to find advanced PBP data for each CFL game?

???

advanced? you mean before the game is played?

detailed as in "3 yard pass from Ray to Owens on 2nd and 5"

you mean this

http://www.cfl.ca/statistics/statsGame/id/11813

Indeed!

I'm not sure why anyone would want to go through this, but it's good that it is available.