There is no source coming from a slave or anything close. The best I can do is to suggest Camus, The Rebel, in which he points out Spartacus made captured Romans fight in an arena like slaves did. Camus' point is that Spartacus was not rejecting the institutions of slavery or arena combat, but rather wanted to dominate it himself. Spartacus is not really a rebel; the only problem he has is who is in charge (And Camus was someone who knows something about rebellion - fought in the French resistance, lived through the war in Algeria, so on and so forth). Unfortunately I don't have Camus' book on hand, and anyway being French he didn't feel the need to give his reference for that material.

K, I found Camus' comment:

However, as Andre Prudhommeaux remarks ( in The Tragedy of Spartacus ) , this rebellion introduced no new principle into Roman life. The proclamation issued by Spartacus goes no farther than to offer "equal rights" to the slaves..... The slave army liberates the slaves and immediately hands over their former masters to them in bondage. According to one tradition, of doubtful veracity it is true, gladiatorial combats were even organized between several hundred Roman citizens, while the slaves sat in the grandstands delirious with joy and excitement.

The source he's referencing (but doesn't cite) is Paulus Orosius, History against the Pagans 5.24:

Once, at the funeral of a married woman whom they had taken prisoner and who had killed herself in agony because her honor had been violated, they put on a gladiatorial show of 400 of their captives – that is to say, those who had once been the objects of spectators were going to be spectators themselves....