Yes. The double walled stainless "chimney" is going to cost you. Now. Here's where it's a great thing that you posted here...

When I was getting quotes to get a Vermont Castings the "installer" wanted FIVE times the price per length of the same exact stuff they had at Home Depot. So if he's a "friend" have the two of you go to the Home Depot, buy what you need, and then make sure you take care of him fair. The materials are NOT expensive. These guys make most of their money from the "fear factor" of having "fire" in the house... so they think they can charge you a lot. The most important thing is to make sure the run has as few turns as possible and is as short as possible. Remember the 10' rule, and make sure that when it passes through walls, floors, and roofs that the proper specifications are kept.

The hearth area isn't too big a deal, just remember to make sure and use 1/2" Durock under any tile that is with a certain distance of the stove... all the code, etc. is on the net... and your area may be unique.

Right now I'm looking at doing it in the Spring, my situation is that I REALLY do NOT want to go through the roof, I want to elbow 90* and go up the outside wall... the roof above is a walk-out deck and it'll look like hell... but I'm being told that the stove will work MUCH better if it is a line-shot straight up.

So I'm looking into alternatives.

Good luck.

Pete