Went last Sept and paid about £30 for Pacha (Subliminal/Underwater - was there last June too and was about the same), Space we Love Sundays was about £40, Four:Four at El Divino £25. Going back this Sept think the prices will be about the same this year. My mates were there in July and they said prices for big clubs were all about £35/£40 with discount flyers so hopefully Sept will be the same. Depends what nights you go I suppose. Dearest will of course be We Love Sundays, Manumission and Cream, Ministry of Sound and maybe Judgement Sundays. Despite what people say I've never heard of anyone pay over £45 for a club (maybe at the door but no-one does this)
If your into Space check out the website where you can buy tickets for all the days/nights there. Think most of the other clubs sell tickets online so worthwhile checking them out. Also get pally with the flyer people/workers for passes etc.
Be prepared to pay a lot for drink in clubs though - doesn't matter when you go they are EXPENSIVE!! Eden/Es Paradis and a few smaller clubs are not too bad compared to El Divino, Space, Amnesia, Privilegeand Pacha. £10 for a JD n Coke, £6/8 for beer and anything from £4 - £8 for water!
When you going? I'm on my way next Sat night!!!!