I chose CD because i was sceptical about how effective the group therapy would be - but i do plan to pay for a fully trained psychotherapist after i am at goal and dealing with food again.
To give you a guideline, I'm in london and my CDC charges £1.95 per sachet (shakes, soups, porridge) and £2.10 per tetra / bar. My weekly cost therefore depends on how many of each pack I buy, but generally comes to £43-45. Which is significantly less than I was spending on food,; lunches at work; evenings in the pub; wine at home; diet cokes; sweeties when i filled up with petrol etc, etc