I would go after the agents that get the listings.
They are typically the ones that arrange for the services.
Sometimes their is also a field asset manager that arranges for services.
Call the real estate offices.... asks who is their REO listing specialist and start with them.
You can also search for Field Asset Services in your area...and contact those people.
Be aware we want to pay virtually nothing.....want you to do a lot,...make sure you have insurance...can wait to get paid 1-2-3-6months and sometimes not at all. It's not an easy business.