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Dear XXXXX hopkins,
There are several different types of weight loss surgery and they are detailed in this very helpful article: http://www.uptodate.com/patients/content/topic.do?topicKey=~M/dMOpAexEBIp7
The cost depends greatly on the individual surgeon and the institution as the technologies available vary widely as does insurance coverage.
I hope this is helpful and please let me know if you have more questions.