Yes it is ok to say that (in the right situation). I don't have much money (to go out to dinner). I don't have much money (to go shopping).

It is completely correct and normal.

yeah it's right , do u learn english or arabic ?

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yes but in the examples above, e.g. "to go to the cinema", you would usually say "I don't have *enough* money to...[buy a diamond ring]" etc