This website demonstrates regional variation in pronunciation with examples of how people in different parts of the US pronounce the word “bought.”
http://www.utexas.edu/courses/linguistics/resources/socioling/boughtmap/index.html
Creole, Gullah*
http://www.youtube.com/watch?v=EPGx1icFdLQ (From 5:00 or so)
[youtube]http://www.youtube.com/watch?v=EPGx1icFdLQ[/youtube]*Audio and video are not synched accurately.