To My Old Master (1865)
lettersofnote.com
lettersofnote.com
Another thing I didn't know: the Governor of Tennessee at the time was Andrew Johnson, who became president after Lincoln was killed.
1. http://www.tnhistoryforkids.org/stories/emancipation — this web page says it's "for kids"; one wishes all web pages were so informative.
As a lump sum.
Of course, this doesn't take into account things like income disparity between countries and so on - that is, median income in Bangladesh is very different than the US today, but this was Antebellum south, at a time when America was still a developing country.
All this to say - maybe $4k/year was a "fair price."