The cheapest option should be airport bus E11. Get off at Luard R oad Hennessy Road, the 18th bus stop. It is just in front of the hotel. Bus fare: 21HKD. You may take bus A11 and A21 also, which cost 40 and 45HKD, but faster. You may pay 300HKD or more if taking taxi. You can get in one cab. Suggest you take direct shuttle bus. You need two transfer on MTR train after the S1 bus to Tung CHung. Not convinient for you with lugguage and kids, and not cheaper than bus E11. A locker in Disneyland costs 40 or 50 HKD per piece of luggage, according to the size.