Where can you eat cheap in Milan?

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A few days ago I started a similar discussion, I asked what were the places people should go to when visiting Milan... Now my parents and me have the trip all planed, flight and hotel are booked, but we hear it is very pricey to have a meal... So if you live in Milan or if you have already been there, could you please give us some pointers on where are the best places to eat a meal for a small price?