A demo lien will probably be at least $8k which could also kill the deal.  

They usually only have had two roofs done (one had 3 layers on the rear and that posed a difficult demo) and a lot have some upgrades over the years that saved me some money.

You would likely need to go to small suburban to rural towns with weak demo's.

I've requested a demo from Doorloop too.

It's the easiest as well, and everything can be bought at home & garden stores/walmart/homedepot.http://i223.photobucket.com/albums/dd154/tonytwotime_2007/IMG_0087.jpg(setup)http://i223.photobucket.com/albums/dd154/tonytwotime_2007/IMG_0088.jpg(bubbler is bubbling)http://i223.photobucket.com/albums/dd154/tonytwotime_2007/IMG_0089.jpg(a few plants for demo.)http://i223.photobucket.com/albums/dd154/tonytwotime_2007/IMG_0090.jpg(all plants i'm planting. some dirt, some hydro)Supplies1 large dark colored container1 dual outlet air pumpAir tubing2 air stones (to oxygenate the solution)solo cupsexpanded clay pebblesepsom saltgeneral hydroponic solutionutility knife, or drill with hole cutting attachment

Most bathroom doors are 28" or less and trying to get that big clunker of a one piece into a bath is difficult and usually requires some demo and repair.

if the land is zoned for it, you could even demo or sell the house separately and re-purpose the land for other use.I'm eager to see what someone with more xp has to say...

I signed up for the free demo...I will update after I learn more about it.

This can be done by any demo company or day labor force.  

If it was a meth lab you'll probably have to demo and get some kind of environmental certificate - but honestly I don't know as I've only ever ran from meth labs.