Dave, I used to do it for used car yards a few years back.
Mate, there's easier ways to get screwed.
This was before Unsmoke brought out their Tabacattack range so it's tempting to re visit it.
A couple of things to consider. Unless you're doing the deodorisation at high temps, the next time they lock the car up on a HOT summers day, the odour WILL be back.
Secondly, when they smell it again, guess what they think? That guy RIPPED us off!! Not good for business.
I was using a large thermal fogger and I imagine the price you're quoting is for an electric kettle style. I doubt that will work as well as the big units so you may be even further behind the 8 ball.
Another factor to consider, and maybe this should have been first, the FIRST principle of odour control is removal of the source. So a quick fog of a vehicle, will have little benefit when the carpats and fabrics (Sink effect) will still be holding the source. Also, what about the vent/fan/ac unit system? How will you eliminate the source in there? Finally, the other typically non porus surfaces like dashes, trim, plastic etc. The car is full of it and when it heats up. the odour WILL come back out.
Sounds like a no goer but I'd be keen to hear of anyone else that may have had success in this. I stopped probably 4-5 years ago but back then, I was charging $200 plus tax and offering a 6 month warranty. I didn't have too many claims, but the few I did, had been sold to smokers who complained of a smoke smell still in their car :roll:
John