Am I right to say you are a first-time visitor? Assuming you are then www.attraction-tickets-direct.co.uk and www.orlando-ticket-deals.co.uk are among the cheapest if you want to buy online before you go and get proper tickets rather than vouchers. I'm sure if anyone else on these boards knows of anywhere cheaper they will be along to let you know. On the same point, theme park tickets are not cheap, it's more a case of some outlets being cheaper than others. We are a family of 3 and Disney tickets alone that allow us a good deal of flexibility over a 2 week period cost in the region of £500. Add on Universal, Seaworld, Busch Gardens, Kennedy Space Center and a host of other attractions and you soon realise where the bulk of your expenses (apart from the cost of getting there) is eaten up. Feel free to ask any question on anything Disney/Florida. We're to help each other.
Hi Liverpoolboy and welcome to the DIS We got our tickets (including DC) from www.attractionticketsdirect.co.uk and they were great. As already said they are tickets, not vouchers, so you don't waste time when you get to the gate.
ww.mapleleaftickets.com are very good and issues actual tickets too.
I agree with what has already been said though, tickets do not come cheap, there are different opitions available though at both Disney and Universal that should cater for most needs.