They are usually available in big box plumbing departments or certainly online.When a spill of water reaches a floor, it (the water) completes the connection for the switch (which is connected to a valve) thereby shutting off a home's water supply.In that case you have an inconvenienced tenant calling because they don't have water versus the alternative that you've experienced.I don't think that they are too expensive but may need to be installed by a plumber.Just my 2-cents worth.Travis

It seems as though the amount of metal in the frame, roof and siding has to be worth something.

I have looked online, and seen some reasonable prices, but I'm a little worried that the installation might be an issue.

My credit is pretty good (760+ FICO score using both installment and rolling credit) but obviously the part about being unemployed is going to make it extremely difficult to get a loan through traditional routes.

I recently had hardwood floors installed in my residence.  

If you have mortar caps then a metal flue cap, if the mortar caps are cracked, that could be the culprit too.

Only buy a 100' roll if you are installing a ground line.

or is it the job of the windows'/trims' installer job? 

Welcome, be sure to take advantage of the fact you have one of the largest military installations in your back door.

You would just need to install water and sewer for the second half.