Are they particularly expensive, Andy? You get what you pay for in life, don't you? There's excellent free tuition included in the price - you just have to ask and you'll get an instructor come out with you, which was the deciding factor for me when I started using them in 2004. Good service, friendly people and a fun day that is always well organised and, in my experience, very safe. Can't really put a price on that, can you?
Carbon, get your membership fee in to Lizzie, then ask Mark at No Limits for the DSC 10% discount and make up your own mind.