Cheap Eats in Milano? (please no pizza and aperitivo postings)
This may not be what you are looking for, but I was in Milan last year and was surprised to learn that many bars serve food at lunch time at a very reasonable price. There aren't generally a lot of things to choose from, but if you are on a tight budget, you can definitely make your money go farther. Most bars also serve hot and cold panini at lunch time too, and they can be quite good, filling, and reasonable. I never ate in a restaurant at lunchtime, just bars. Most of my experience has been in Rome, where this is not the case.
I live in Milan and here are a couple of my standby places that are inexpensive (I'm sure you well know how expensive it is to eat out in this city).
Via Alessandro Tadino, 32
They are only open Monday - Friday, and service is brisk - but the food is good and simple. You have to book otherwise its impossible to get a table. One of the last "real" trattorias in Milan
Ristorante De Carlo Da Teresa
Via Pavia, 3
This great, simple place serves inexpensive specialties from the Puglia region such as orecchiete, burrata and seafood. Not a huge menu, but it does change often. House wine is pretty good too! Again, the service can be a bit strange, but the food is always good.