We paid £270, including membership to the NCT. I would say it was some of the best money we spent. I must be honest, I didn't do it for the information on birth/breastfeeding etc. And I was prepared for them to be a bit militant about certain things, and as I result, I was really pleased to realise I learnt quite a lot. We covered c-sections, our NCT teacher had had one and basically said the same thing - she just knew that when they mentioned an emergancy c-section that was what was necessary for her and the baby. They were very pro breastfeeding, but I have to say, I don't mind that.
We borrowed a pram, bought a second hand one for the second baby (due any day now!). I was also really fortunate to get loads of used baby stuff from my brother and sister-in-law, and almost all of my DC1's clothes have come from hand-me-downs (I love free clothes!), or from NCT sales. Aside from gifts for bithdays and christmas, almost all of my DC1's toys have come from NCT sales too. I always help set-up so that I can do the pre-sale. Incidently, the percentage of sellers profits taken by the NCT here is 25% (just gone up from 20%). It might still be better value to sell on e-bay for example, but much less hassle and you are supporting a charity. So, as well as the social circle I have gained (who have been my mummy life-line), I know I have saved well over the cost of the sessions in terms of clothes and toys for DC1 and now for DC2.
At the same time, £250-300+ is a lot of money, and I can totally understand that some women just wouldn't feel it was what they would choose to spend precious money on with a baby coming! If you don't need to get to know a group of friends, then you can do all of the pre-sale/playgroup/more general social get togethers by just by paying your £30 or so for NCT membership, and that is REALLY worth it!