Never been to curves since I'm a man, but when I bought my Wendy's salad the other day it came with a 2 week free trial for curves, lol. You could try that and see if you like it. I think it is a Nationwide promotion.
On the cost of losing weight:
You can't put a price on your health, but I have found I am coming out on the positive end. After losing my 1st 50lbs I was able to get off blood pressure medication. That savings is paying for my monthly WW fee. By not eating at restaurants or take out and making healthy meals at home I am saving money also. Dieting has been a win/win for me.(my kids do insist I take them to Wendy's or McDonalds at least once a month)