I did although I'm not doing the work now. I don't have a single figure to give you, though.
The course fees will depend on where you train, you should find that information on their websites. I think mine were something like £1k for a certificate/skills course, and £4k per year for the 3 year diploma.
One of the big costs is your personal counselling/therapy as a trainee and again requirements are different on different courses. I would budget for a session a week throughout the training at around £40-60 depending on where you live (i.e. it's more expensive in London).
Other than that, I paid for train travel to the training college, and bought about 15 books (they had a good library as well).
Most people on my course were working part time to fit it around the training, especially in the later part of the training when you start seeing clients at placements. So you might need to consider if you'll be able to drop a day at your current job and take a pay cut accordingly. You might be able to fit it around full time work too, some did.
As I said, I decided not to pursue it as a career but still got a lot out of the training and have used it more indirectly in my other work. If finances are an issue though, you should consider the earning potential after training - it takes time to build up a private practice if that's what you're hoping to do, and there aren't really many paid jobs to go around, certainly not full time. I probably would have maintained a small scale private practice but financially it was difficult to do that with rent on a consulting room, supervision fees, professional body membership, supervision fees etc... It may sound like you'll be able to earn £50 per hour but a lot of that is eaten up by costs (and tax!). Still, it's a really interesting training and interesting, fulfilling work.