Surgery abroad?

[Ty23]

Hi all.
After being refused surgery on the NHS due to my BMI being to high I need to look at surgery done privately. Obviously The cost of surgery private in uk is very expensive. People have suggested abroad so would like to know if anyone has any recommendations? Obviously the cheaper the better but don't want to go to some back alley place ha.
Thanks a lot. I need this Surgery as its ruining my life