I think it's not so much that slaves are cheap in this world, it's just that he's (implied to have) been on the market for so long his price has bottomed out. I get the impression he's not only been a slave a long time, but is also quite a bit older than what most people prefer in slaves, so there's no demand to keep his price high; she bought him for what was basically pocket change (if you convert it to Yen and then to USD, he cost her a whole 4.50$).@mechpolaris One thing I want to know is how they build the world (so give serialization) to make slaves really cheap