Wow, I thought I recognized that picture! I saw the ad(I'm in Regina).
It does look like a pretty good deal. The general price range I've found around here is about this:
Cornies: $20-25 each from restruants
CO2 Tanks: $30-100 for a 20# (What he has there)
So his price there would be pretty much right in line with the cost to buy everything yourself, maybe a little lower. If you need all of that stuff I'd say go for it. It would definatley be a lot easier then piecing everything together.
One thing to check. Find out if those are pepsi CO2 tanks! If they are pepsi CO2 tanks no filling stations will fill them for you. Thats what I found atleast in Regina. They very well could be. Thats the same style regulator that pepsi uses in this area, he's using ball lock/pepsi kegs, and pepsi paints all of their tanks blue.