Eurodisney spends

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Hi all, we have had eurodisney booked for begining of October. We are staying in the Newport hotel on a half board basis. How I have kept this secret from the children for just under a year I don't know! I was lucky enough to Disney a few times as a child/teen so I know roughly what to expect.But I'm looking for tips on spending please. A very unexpected large car bill has eaten into our spends!!
I am already planning on filling up at brekkie and wrap some rolls etc for lunch and take some water in and fill up at the fountains.
I really would like to be able to get the children a couple of small treats ie mickey/Minnie ears, stationary and also two larger perhaps a cuddly toy and jumper or pjs. Has anyone been recently and able to tell me a rough guide on prices?
We have DD1 aged 6.5, DD2 aged 5 and DS aged 2.5 then myself and DH. Staying for 3 nights and 4 days, we are going in term time (couldn't afford out of term and it's our only holiday for the last year and a half so very excited!).
Any tips would be appreciated on top of the snacking/eating in ques to pass time, meet Minnie & Mickey by the MGM studios, buy water in a shop near the train station?

My and my dd aged 14 will be going to disneyland paris in march 2015. We are staying at santa fe and going from monday to friday. Can someone advise how much spending money we will need was thinking 800 is this a good figure ?

We went full board and it was worth every penny. Literally couldn't eat all the food, you get an afternoon snack and drink too, which we didn't have because we were still too full from three course lunches. I bought a couple of toys on the last day so other than that didn't spend anything, not a penny. Also had a lunch at "Walts" on Main Street one of the days and it was one of the nicest meals I have ever had. Filled up water bottles before we went in too so didn't have to buy water. It was brilliant I have to say, loved every minute. Hardly any queues when we went in either. Didn't see one ride with more than 20 minute queue, most were 5. However this was during term time.