I'm homeless (staying with relatives, & on food stamps).

For the hot prospects, we use a real handwritten letter and handwrite the envelope with a real stamp. 

What I detested was the process: collect all the bills, open the mail, rip off the stub, put the remainder in that bill’s receipt folder, write the check, make the journal entry, stick both stub and check in envelope, put on stamp, lick envelope, write in return address, etc.

My engineers usually charge about $400 to certify or come check out etc and give you a stamped letter.

Before anyone can venture a guess, they need to know where the property is; transfer taxes, recordation tax and doc stamps can vary wildly across the country.  

I've known architects in NYC that will review the plans and provide a stamp for a set fee and have no other involvement in the project.

On the envelope you could include personal touches like a coffee stain, stamp, a cologne spray, an ink smudge...anything to encourage her to open it.If you have no valid mailing address, you could search her name on your county's tax assessor's office to see if any other properties come up...also check ADJACENT COUNTIES' tax assessor's records. 

We figure each mail piece costs about 85 cents when we either purchase a list, create our own list, pay for the labor, paper, stamp and envelope.85 cents is not a lot of money, but 20,000 mail pieces will cost $1700 and then when you don't get one good lead (and that is common for 20,000 letters) then that $1700 eats deep into your pocket when you can get thousands of leads for free.One problem with direct mail is I get no less than 3 letters every day of the week from investors wanting to buy my properties.

@Jeff KathwellItems to consider when selling a houseYou may pay around 7% to 9% of the value of the home in fees(Realtor Commissions, Title costs, Title Insurance, Stamps etc).The sale may also result in taxes(Federal taxes + State Taxes).You might be able to avoid taxes by doing a 1031 exchange or QOF Fund.You no longer have an asset that can potentially provide you cash-flow / appreciation.Do you think you can make up the 7% - 9% in fees + Taxes over time by buying another property?

He is disabled and not employed and says he only gets 400$ in food stamps to support his family.