Pitchmen was the show, a reality series on Discovery. Anthony was also on there. I've never bought any of his products he screamed about for years. Not even Oxi Clean.
I *DID* find an infomercial from 1989 on a VHS where he was the host, and promoting 2 different products in a half-hour. One of those was a Shamwow-type product, which Vince Offer would promote in the late '00s. No screaming, no yelling. Very 'bland' and young in those days.
I think my favorite of his 'screaming' era was for the Mighty Mendit. "IT HAS THE STRENGTH! TO WITHSTAND STORM! FORCE! WINDS! AMAZING!"