We find Maple Leaf very good, you can order online or buy direct from their store in Kissimmee.
They issue actual tickets at discounted prices and whilst you may find slightly cheaper elsewhere I can recommend them.
Depends on what you are after ie. Ultimate or MYW for Ultimate then I would recommend www.attractionticketsdirect.co.uk & for MYW www.mapleleaftickets.com . The US sites give you a better selection of options rather than the standard 5-7 Day MYW that they offer us here
HTh SD
I bought mine from attraction tickets direct. I don't know if they were the cheapest but were very reasonable and were real tickets, not vouchers. Good service and I would reccomend them. We bought Disney 14 day Ultimates, Universal 2 Days (with 5 free) and Discovery Cove (inc Seaworld).