You have written 'har' instead of 'her'. If this was intentional then I would say your sentence is incorrect because you have put a present tense marker 'r' on the verb 'ha'. However, if you are wanting to say 'The food is cheap to have', then the sentence works except it should be written 'Maten er billig å ha'. I think a better sentence would be 'Maten er billig å kjøpe' (The food is cheap to buy). Both sentences seem incomplete to me, though. If 'har' was a mistake, then 'Maten er billig her' (The food is cheap here) is a correct sentence.
Please note that I, like you, am learning Norwegian and because of this I possibly have made errors here.