Hey @McKinley Crowley - You know how I love probates.
Probates have been my number one source of leads for more than a decade. These folks almost always have to sell the house. It's just a matter of whether they list it or sell it to an investor. I have been very successful with direct mail campaigns. I personally never call them unless they have first called me. I believe understanding the mindset of those folks going through that process is one of the main reasons I have been successful.
I don't call them because someone they love has passed away, and for more than a decade I have heard how much they hate and resent the insensitive intrusion. I personally don't mail to surviving spouses. It's not a foolproof system, the I do a pretty good job of figuring out if they have one on the tax assessor's site.
I'm very lucky here (Louisville KY) because the information is in the newspaper. You only need 4 pieces of information. The name and address of the deceased, and the PR. Sometimes that is an attorney, but not usually. One more place to look is online. Here, there is something called online records. Wills are published there. So for instance, when the probates come out once a month, I could look up the wills for that same month and often find missing or additional information.
There are 3300+ counties in the US, and everyone is a little bit different. You're going to have to do some detective work (and this is where most people quit). If you're willing to do the work, you can help a lot of people. And for agents, the field of probates is wide open.
One thing I would like to mention is that I only use white, computer generated, personalized letters. You need to do a mail merge so you are talking to one person. Also, use standard #10 envelopes. This is a niche where you don't want to send them something in an odd sized or colored envelope. The last thing you want to happen is for them to open an envelope that looks like a sympathy card. I have written a lot about probates on my blog and here on BP. I hope this helps.