or you could even use the word in a different way...Well there is the secondary market where less affluent buyers can pick up some good deals, Besides just because one Master is bored doesn't mean the someone else won't see something they like.
Then of course you can sell them into the commercial market. Brothel's are always looking to pickup extra stock. Particularly for their 'rough usage' clients.
Then there is the entertainment market where a girl can be tortured and executed for the audience.
Finally I suppose you can just chain her to a tree or lamp post with the word "Free" written across her tits.