There aren't really "shops" per se, at least in the sense that you'd want to go shopping there, but here's what's available:
On the Mezzanine level:
McDonalds
Jamba Juice
Nuts on Clark
Corner Bakery
Nino's Sanwichs
Cajun (which is actually a Chinese-style place)
Burrito Beach
Gold Coast Dogs
Robinson's (ribs and bbq)
65 ("Chinese")
Cinnibon
a bar (I think called the Snuggery)
1 Relay news stand on the NE mezzanine area
1 Relay news stand on the SE mezzanine area
1 currently vacant storefront
Other areas:
a diner/buffet/cafeteria type place immediately east of the grand waiting hall
1 Relay news stand adjacent to the west (original) waiting hall
1 Relay news stand on the east side of at track level, north of the ticket counters
Sometimes a flower stand by the north tracks
a shoe-shine shop and I think a dry cleaners near the Metra commuter rail ticket counters
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