care credit
I haven't used CareCredit for weight loss surgery but have used it 3 times for dental work. I have had a good experience with them and saved the interest on the loans each time. Do be sure to meet all the payment deadlines, as if you don't, they can charge you the full interest. Also, keep track of the loan expiration dates, ex. if it's for a year, be sure to pay it off before then, or you'll be charged the interest. They didn't tell me those dates were coming up (sneaky, huh?). I just paid the last of my loans off 2 months ago. I think they're a good option as long as you follow all the rules to the letter. Good luck!