Is there such a thing? A black market or a general market for Strategies with a track record? Greybox or blackbox.
Of course there is. Unfortunately, without a reference from someone I trust, I can't point you to its coordinates.
I am not talking about stolen code here folks. Legitimate codes with track record up for sale. It was my mistake with the blackmarket vocab... What I mean is underground market where dealers/coders sell source codes for algo trading strategies!
systems with track records, you might try timertrac.com, collective2.com, futurestruth.com, strategyrunner.com (find their systems page), theta research (url???), hulbert financial, timerdigest.com But these are no guarantee of a working system, even the good ones. You will usually find a goodlooking system does not outperform once you subscribe to it. In other words, there is no free lunch. Learn to trade, or spend years losing money.