In some cases you may qualify for free mindfulness courses on the NHS, so I'd check that before spending any money.

I'm currently using a book called
Mindfulness: A practical guide to finding peace in a frantic world and it has a similar 8-week MBCT course, with an audio CD containing meditation tracks. I'm currently on week 4 and I've found it very good so far. It's a lot cheaper than paying for a course with a tutor, but you do have to be self-motivated.