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Hmmm...I've thought about this a bit, and for the life of me I can't think of any that fit the criteria you are looking for. The only one that might come close incorporated a small cafe and lottery/magazine kiosk. However, I'm not sure how successful it is - I believe the cafe may even be gone now that a Tim Horton's (think Krispy Kreme, only better) opened up right next door to the terminal.
Is this an intercity or a local transit terminal?
Typically I think you could only expect to support convenience-type retail uses, unless you also have an on-street presence.
It could be either an intercity or local transit terminal. I've come up with a few examples of transit agencies that have done this on the west coast: Santa Cruz Metro (CA); Golden Gate Transit (SF Bay Area); Lane Transit (Eugene, OR); and Cherriots (Salem, OR). All of these incorporate small retail spaces, such as a coffee shop or small convenience store.
I would like to find examples in the mid-west, east coast or Canada.
They are more like 300,000 but Spokane, Washington put in a new transit center a few years back and it seemed to work really well. Especially as it was working in a dying downtown. I'm afraid I don't know who you should contact.