Why does body contouring prices vary from hundreds of dollars to thousands of dollars?

I have started seeing alot of positive things and hype about the new laser body contouring procedures. The place I am interested in is  they claim to use the YOLO laser for services. Why/how are they offering coupons for $400 for up to 9 treatments, when other places are charging thousands for similar procedures. Is this a huge bargain or scam? All information is appreciated before I invest in these procedures.

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