Unless you know the seller personally, there's no such thing as an off-market deal.

Sure, there are properties that are not listed in the MLS. But every property that gets to you via your "deal-flow" is just a placebo to make you feel some sense of exclusivity.

Any property a wholesaler sends you, has also been sent to several other individuals who have passed on it. If a good deal is simple math, why wouldn't they be able to crunch the same numbers as you?