A lot of great strategies out there for finding motivated sellers. Depends on what your looking to spend.
From what I've done personally. Best and most expensive is paying for online leads from places such as expert leads and lead geeks. There are tons of those types of companies. The roi is usually pretty high because those people are actually usually distressed and want to sell a property.
Best free method. Driving for dollars locally and skiptracing the addresses to find the names and phone numbers of the owners. And cold calling to see if they are interested in a quick cash offer.
Tons of methods in between those.
Best way in my opinion to find cash buyers is pick a market to do your marketing in. Find a good deal and the buyers will always come.
A good buyer finder hack. Once you have a property under contract. Find the similar comps with whatever your using. Propstream, zillow, redfin, mls access, and reach out to the agents of recent similar cash transactions and see if they have buyers for your deals. A quick way to find cash buyers for your deals.
Just some quick tips. There is way more info to this but once you get going it all falls into place.