The Debate Question that we ask ourselves is "Did Muhammad get a good deal?" as we read the following hadith:
Jabir (Allah be pleased with him) reported: "There came a slave and pledged allegiance to Allah's Apostle (may peace be upon him) on migration; he (the Holy Prophet) did not know that he was a slave. Then there came his master and demanded him back, whereupon Allah's Apostle (may peace be upon him) said: Sell him to me. And he bought him for two black slaves, and he did not afterwards take allegiance from anyone until he had asked him whether he was a slave (or a free man)." [Sahih Muslim 10:3901]