What it costs, and what you should know first
A percentage of what is actually recovered, capped by law, and nothing at all if nothing is recovered.
The terms
Unclaimed funds held by a state can be obtained directly from that state by the owner, or an authorised representative of the owner's estate, without paying a fee.
We say this first because it is true, because New York requires it be disclosed, and because you should know it before you talk to anyone in this industry — including us. What we sell is the finding, the proof, and the paperwork. If you would rather do it yourself, the states' own search tools are free and we will happily point you to the right one.
So why use anyone at all
For a single account in your own name, often you should not. The state's website is free and the process is manageable.
It gets harder when the name on the record is not the name you use now, when the property sits in several states at once, when the entity has been acquired or dissolved, when the claim is against an estate, or when the state comes back asking for documentation of a transaction from fifteen years ago. That is the work.