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Are there any warbands hanging around still flying the colours of the sons of Horus? Or did they all throw in and become the black legion?

I mean its possible but one of the first things Abbadon did was kill of rivals to the title of Warmaster and bend every other remaining member of the old Legion to his will. Abbadon made it very clear he believed that Horus and the Primarchs were failures only out to soothe their own egos rather than actually try to overthrow the Emperor.

There are.

https://warhammer40k.fandom.com/wiki/True_Sons