Newbie Install Quote - Am I getting screwed? Any ideas?

I'm looking at an Avalon Arbor pellet stove and had a visit with my local Avalon dealer. They quoted me $2600 for the stove and another $1400 for the parts and install. $500 for the installation seems relatively reasonable for Eastern, MA, but $900 for the four inch pipe/elbows fittings seems a little steep.

Here's what I need to do:

From the Tee at the back of the stove, run 8' vertically through a ceiling so that should be a tee, 5' and a 3' pipe (or 2x 4' or however we make it up) and a ceiling plate.
Once through the ceiling turn 90 degrees horizontally and run about 5' of pipe out the exterior wall, so I need a 90 elbow, a 5' pipe an exterior wall plate, and a horizontal cap.

Tallying all of this up using DuraVent at hartshearth.com puts me at $590 for:

60" Black Pipe
36" Black Pipe
Black Tee
Black Ceiling support

60" Stainless Pipe
2 45 degree elbows (in case I need some wiggle room btwn joists)
Wall Thimble
House Shield
Horizontal Rain Cap

I realize my local dealer needs to make a profit and I'm happy to give him one, but if I can get the supplies retail for $590 I assume he can get them for less-- let's be nice and say $500--is it reasonable to expect to pay almost a 50% markup? If not, what is a reasonable profit margin? Is he giving me the "15% off sale price" of the stove and marking up the install supplies to make up the loss on the stove? Any insights into what a fair price would be is much appreciated. Is DuraVent crap and that's why it's so much cheaper? Should I bag the local dealer, get one in NH, save on the sales tax and do it myself?

Thank you for your help!
Steve

"Should I bag the local dealer, get one in NH, save on the sales tax and do it myself?"

I like that idea, go for it. I am doing my own install if my stove ever comes. $130 for direct vent. Yes, a installer on another site said DuralVent is crap, need to seal all seams or they will leak, he states. He said Metalbestos is not much better, not much to choose from, DuralVent claim they vent 3 out 4 stoves.

I'm a big diy fan. If you can do it yourself and also maintain/repair later
then I say go for it and save yourself some moola.


I have to ask though, what is the 90 degree turn and out the wall all about?
Seems odd to me..... Friend of mine did a through the ceiling install and he
went straight up, through ceiling and attic, and out the roof. Nice clean install.

We're installing on the first floor, and removing an old wood stove that illegaly went up the interior chimney (shared with the Furnace) about 6 feet from the exterior wall. If I go thru the 1st floor ceiling I end up in a closet. The side of the closet is an exterioir wall. Hence the 90 degree turn I need. My house is 200 years old, so, getting all the way through 2 floors could be a real nightmare...

Thanks, Steve